Percentage of gumballs that are within standard deviations of the mean is 68% and have a diameter between 2.20 cm and 2.22 cm.
To find the percentage of gumballs that are within one standard deviation of the mean, we need to use the empirical rule, also known as the 68-95-99.7 rule. According to this rule, for a normal distribution:
Approximately 68% of the data falls within one standard deviation of the mean.Approximately 95% of the data falls within two standard deviations of the mean.Approximately 99.7% of the data falls within three standard deviations of the mean.Here we want to find the percentage of gumballs that are within one standard deviation of the mean. So we can use the first part of the empirical rule and say that approximately 68% of the gumballs have a diameter between:
Mean - Standard deviation = 2.21 - 0.01 = 2.20 cm and Mean + Standard deviation = 2.21 + 0.01 = 2.22 cm
Therefore, approximately 68% of the gumballs have a diameter between 2.20 cm and 2.22 cm.
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1. All square, upper triangular matrices are diagonalizable. (T/F)
2. If a matrix is diagonalizable, then it is invertible. (T/F)
1. All square, upper triangular matrices are diagonalizable. (TRUE)
2. If a matrix is diagonalizable, then it is invertible. (FALSE)
Understanding matrix1. True: All square, upper triangular matrices are diagonalizable.
A square matrix is diagonalizable if it can be transformed into a diagonal matrix by a similarity transformation, which means there exists an invertible matrix P such that P^-1 * A * P is a diagonal matrix. Upper triangular matrices have all their elements below the main diagonal equal to zero.
Since the eigenvalues of an upper triangular matrix are equal to its diagonal elements, we can form a diagonal matrix with these eigenvalues. Since there exists such a diagonal matrix, all square, upper triangular matrices are diagonalizable.
2. False: If a matrix is diagonalizable, it is not necessarily invertible
Diagonalizable matrices can be transformed into a diagonal matrix with the eigenvalues along the main diagonal.
However, invertibility requires that the matrix have a nonzero determinant, which means that all of its eigenvalues must be nonzero.
If a diagonalizable matrix has a zero eigenvalue, its determinant will be zero, and it will not be invertible. Therefore, diagonalizability does not guarantee invertibility.
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4/25/2015
Louisiana EAGLE
Item 4:
Armando designs a suspension bridge. He makes this drawing to show its size.
SIDADE
50 ft
230 ft
After the bridge is built, Armando is asked to design another bridge. The second bridge needs to have a similar shape to Armando's first
bridge, but it only needs to be 184-feet long. How tall does the second bridge need to be?
A. 32 feet
B. 36 feet
C. 40 feet
D. 44 feet
Item 5:
The height of the second bridge that Armando needs to design is 40 feet (Option C).
To get the height of the second bridge designed by Armando, we need to maintain the same ratio between the length and height as in the first suspension bridge drawing. The first bridge has a length of 230 ft and a height of 50 ft.
First, find the ratio of the height to the length of the first bridge:
50 ft (height) / 230 ft (length) = 5/23
Now, we know the length of the second bridge is 184 ft. To get the height of the second bridge, we will use the same ratio (5/23) and multiply it by the length of the second bridge:
(5/23) * 184 ft = 40 ft
So, the height of the second bridge that Armando needs to design is 40 feet (Option C).
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Find the general solution to y"’+ 4y" + 40y' = 0. In your answer, use C1, C2 and C3 to denote arbitrary constants and x the independent variable.
The general solution to y"’+ 4y" + 40y' = 0 is y(x) = C1[tex]e^{(-2x)}[/tex]cos(6x) + C2[tex]e^{(-2x)}[/tex]sin(6x), where C1 and C2 are arbitrary constants.
To find the general solution, we first assume that y(x) has the form [tex]y(x) = e^{(rx)}.[/tex]
Substituting this into the differential equation, we get the characteristic equation r³ + 4r² + 40r = 0.
Factoring out r, we get r(r² + 4r + 40) = 0. The quadratic factor has no real roots, so we can write r = 0, -2 ± 6i.
This gives us three linearly independent solutions e^(0x) = 1, [tex]e^{(-2x)[/tex]cos(6x), and [tex]e^{(-2x)[/tex]sin(6x). Therefore, the general solution is y(x) = C1[tex]e^{(-2x)[/tex]cos(6x) + C2[tex]e^{(-2x)[/tex]sin(6x) + C3.
Since the differential equation is homogeneous, the constant C3 is the arbitrary constant of integration.
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Sort each set of triangle measurements into the appropriate category for number of possible triangles. No Triangles One Triangle Many Triangles 5, 15", 160 45°, 45°, 90° 2.8. 10 7, 24, 25 30", 85°, 60° 5 of 5 Done
5.
Sarah deposited $800 in an account that earns
2% interest compounded annually. Claire deposited
$800 in an account that earns 2% simple interest.
How much will each girl have in their account at the
end of 8 years if they do not make any deposits or
withdrawals?
Answer:
Sarah will have $937.28 and Claire will have $928.
Step-by-step explanation:
All my work is provided in the screenshots that are attached to my answer! Drop questions in the comments and I'll try to respond if I remember/see them lol.
Have a great day!
Can someone please help me ASAP? It’s due tomorrow. I will give brainliest if it’s correct. Show work.
the probability of choosing H or P in either selection is 0.84
How to find the probability?Two random letters are selected from the word Happy, and we want to find the probability of choosing H or P in either selection.
There are 5 letters, 1 is an H, 2 are P's.
Then the probability of selecting one of these 3 in the first selection is:
p = 3/5 = 0.6
And if we don't chose any of these in the first selection we had the probability:
q = 2/5 = 0.4 (choosing one of the a's)
the probability of choosing one of the p's or the H in the second is again:
q' = 3/5 = 0.6
The joint probability is:
Q = q*q' = 0.4*0.6 = 0.24
Then the total probability is:
p + Q = 0.6 + 0.24 = 0.84
The correct option is the second one.
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assume the data are three independent srss, one from each of the four populations of caffeine levels, and that the distribution of the yields is normal. a partial anova table produced by minitab follows, along with the means and standard deviation of the yields for the four groups. one-way anova: rest versus caffeine the null hypothesis for the anova f test is that group of answer choices the population mean minutes of sleep is the same for all four levels of caffeine. the population mean minutes of sleep is increasing as the caffeine level gets larger. the population mean minutes of sleep is decreasing as the caffeine level gets larger. the population mean minutes of sleep is largest for the high level of caffeine.
The statistics indicate that the assumption that the four populations have the same standard deviation has been broken.
a. This research was done via observation.
False, as this is a test. (unlike what Alex89 says). The response variable (minutes of rest) is then recorded because the researcher randomly assigns the fruit flies to one of the treatments, using a TREATMENT, and records the response variable.
b. The statistics indicate that the assumption that the four populations have the same standard deviation has been broken.
False: There is no deviation from the equality of standard deviations. We DO NOT need to test this assumption when the sample sizes are equal. Even if we did, 29.61/19.08 = 1.55 2 means that the greatest standard deviation is less than twice the lowest standard deviation. We are therefore okay.
c. Because ANOVA needs sample sizes, it may be applied to this data are equal.
False - The ANOVA does NOT require equal sample sizes.
3. The correct option is D, For this example, we notice that 3) None of the above
(4) The correct is option A, which states that 4) the population mean rest is the same for all four caffeine concentrations.
Statistics provides a framework for making informed decisions based on data by using methods such as probability theory, hypothesis testing, regression analysis, and statistical modeling. The importance of statistics lies in its ability to transform raw data into meaningful information that can be used to make decisions, develop policies, and solve problems in a wide range of fields, including business, healthcare, government, and social sciences.
Statisticians use various tools and techniques to summarize and describe data, identify patterns and relationships, and make predictions and inferences. They also play a critical role in designing experiments, surveys, and observational studies, ensuring that they are statistically sound and produce reliable results.
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Complete Question:-
An experiment to help determine if insects sleep gave caffeine to fruit flies to see if it affected their rest. The three treatments were a control, a low caffeine dose of 1 mg/ml of blood, a medium dose of 3 mg/ml of blood, and a higher caffeine dose of 5 mg/ml of blood. Twelve fruit flies were assigned at random to the four treatments, three to each treatment, and the minutes of rest measured over a 24-hour period was recorded. The data follow.
Treatment Minutes of rest
Control 450 413 418
Low dose 466 422 435
Medium dose 421 453 419
High dose 364 330 389
Assume the data are three independent SRSs, one from each of the four populations of caffeine levels, and that the distribution of the yields is Normal.
A partial ANOVA table produced by Minitab follows, along with the means and standard deviation of the yields for the four groups.
One-way ANOVA: Rest versus Caffeine
Source DF SS MS F P
Caffeine 11976
Error 538.75
Total
Level N Mean StDev
Control 3 427.00 20.07
Low 3 441.00 22.61
Medium 3 431.00 19.08
High 3 361.00 29.61
3. For this example, we notice that 3) __________
a. this is an observational study.
b. the data show evidence of a violation of the assumption that the four populations have the same standard deviation.
c. ANOVA can be used on these data because ANOVA requires the sample sizes are equal.
d. None of the above
4. The null hypothesis for the ANOVA F test is that 4) __________
a. the population mean rest is the same for all four levels of caffeine.
b. the population mean rest is increasing as the caffeine level gets larger.
c. the population mean rest is decreasing as the caffeine level gets larger.
d. the population mean rest is largest for the high level of caffeine.
Steph Curry posts a video of a puppy playing the piano and shares it with 4 of his friends. The video goes viral and the number of shares increases by a factor of 10 every minute.
a. Write an equation to model this situation.
b. What is the average rate of change for the number of shares from 2 minutes to 4 minutes?
An equation to model this situation will be S(t) = 4 * 10^(t). The average rate of change for the number of shares from 2 minutes to 4 minutes is approximately 19,800 shares per minute.
a. Let S(t) be the number of shares of the video at time t in minutes after Steph Curry shared it with his friends. The initial number of shares is 4 (the 4 friends he shared it with), and the number of shares increases by a factor of 10 every minute. Therefore, we can model this situation with the exponential function:
S(t) = 4 * 10^(t)
b. The average rate of change for the number of shares from 2 minutes to 4 minutes can be calculated by finding the slope of the line connecting the points (2, S(2)) and (4, S(4)) on the graph of S(t). Using the equation S(t) = 4 * 10^(t), we have:
S(2) = 4 * 10^(2) = 400
S(4) = 4 * 10^(4) = 40,000
The slope of the line connecting these two points is:
(S(4) - S(2)) / (4 - 2) = (40,000 - 400) / 2 = 19,800
Therefore, the average rate of change for the number of shares from 2 minutes to 4 minutes is approximately 19,800 shares per minute.
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Write an expression for the nth term of the sequence. (Your formula should work for n=1,2,...) 4 5 6 7 5 6 7 8 Need Help? Watch
The nth term of the sequence 4 5 6 7 5 6 7 8 is given by a_n = 3 + (n-1)/2 for odd n and a_n = 4 + (n-2)/2 for even n.
How to find the nth term of a given sequence?To find the nth term of the given sequence, we need to observe the pattern in the sequence. We can see that the sequence consists of two parts:
the first part is a consecutive sequence of integers starting from 4, and the second part is a consecutive sequence of integers starting from 5, where the second part starts right after the first part ends.
So, we can express the nth term of the sequence as follows:
If n is odd, then the nth term is given by:
a_n = 3 + (n-1)/2
If n is even, then the nth term is given by:
a_n = 4 + (n-2)/2
Using this formula, we can find any term of the given sequence by plugging in the corresponding value of n. For example:
When n=1, the first term is 4: a_1 = 4.
When n=6, the sixth term is 6: a_6 = 6.
When n=7, the seventh term is 7: a_7 = 7.
When n=8, the eighth term is 8: a_8 = 8.
Note that this formula works only for n = 1, 2, 3, 4, 5, 6, 7, 8, ... , since the sequence has only 8 terms.
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Find the directional derivative of f(x, y, z) = 23 – x²y at the point (3,-1, -2) in the direction of the vector v=(-1,-4,-4).
The directional derivative of f(x, y, z) = z³ – x²y at the point (3,-1, -2) in the direction of the vector v=(-1,-4,-4) is -234/√33.
The function is f(x, y, z) = z³ – x²y
We have to find directional derivative at the point (3, -1, -2)
In the direction vector v = (-1, -4, -4)
The gradient of the function is
∇f(x, y, z) = ∂f/∂x [tex]\hat{i}[/tex] + ∂f/∂y [tex]\hat{j}[/tex] + ∂f/∂z [tex]\hat{k}[/tex]
∇f(x, y, z) = ∂/∂x(z³ – x²y) [tex]\hat{i}[/tex] + ∂/∂y(z³ – x²y) [tex]\hat{j}[/tex] + ∂/∂z(z³ – x²y) [tex]\hat{k}[/tex]
∇f(x, y, z) = -2xy[tex]\hat{i}[/tex] - x²y[tex]\hat{j}[/tex] + 3z²[tex]\hat{k}[/tex]
At the point (3, -1, 4).
∇f(3, -1, 4) = -2(3)(-1)[tex]\hat{i}[/tex] - (3)²(-1)[tex]\hat{j}[/tex] + 3(4)²[tex]\hat{k}[/tex]
∇f(3, -1, 4) = 6[tex]\hat{i}[/tex] + 9[tex]\hat{j}[/tex] + 48[tex]\hat{k}[/tex]
The length of the vector is
|v| = √[(-1)² + (-4)² + (-4)²]
|v| = √[1 + 16 + 16]
|v| = √33
To normalize the vector we have
n = (-√33/33, -4√33/33, -4√33/33)
The directional derivative is
∇f(x, y, z) · n = (6, 9, 48) · (-√33/33, -4√33/33, -4√33/33)
∇f(x, y, z) · n = -6√33/33 - 36√33/33 - 192√33/33
∇f(x, y, z) · n = (-6 - 36 - 192)√33/33
∇f(x, y, z) · n = -234√33/33
∇f(x, y, z) · n = -234/√33
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John rides his bike 68 km south and then 6 km went. How far is he from his starting point?
John is approximately 68.26 km away from his starting point after riding 68 km south and then 6 km west.
To find out how far John is from his starting point after riding 68 km south and then 6 km west, we will use the Pythagorean theorem.
The Pythagorean theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In this case, we will consider the 68 km south as one side, and the 6 km west as the other side, with the distance from the starting point being the hypotenuse.
Step 1: Square the lengths of the two given sides.
68^2 = 4624
6^2 = 36
Step 2: Add the squared values together.
4624 + 36 = 4660
Step 3: Find the square root of the sum to get the length of the hypotenuse (distance from the starting point).
√4660 ≈ 68.26 km
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Beckett asked his classmates, "How many days do you floss your teeth
typical week?" The table shows Beckett's data.
Days of Flossing per Week
7
7
7
4
3
1
0
6
6
7
2.
6
5
3
N
4
How many observations did he record?
A. 20
B. 12
O c. 4
O D. 16
Answer: B
Step-by-step explanation: I did the quiz :p
Hope this helps
The correct answer is B. 12. There are 12 numbers in the table, which represents the number of observations Beckett recorded.
The table shows the number of days each of Beckett's classmates floss their teeth in a typical week. The number of observations recorded is simply the number of classmates, or the number of entries in the table. In this case, there are 12 entries, so the answer is 12.
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Alex brough a cell phone for $200 using money from his saving account he is replacing the money in his saving account at he rate of $8 per weeks he already has replaced $80 how many more weeks does alex will he have to put money in his saving account in order to replace the entire amount
Alex will have to put money in his savings account for 15 more weeks at a rate of $8 per week.
How to maintain budget on purchasing cell phone?Alex purchased a cell phone for $200 using money from his savings account. He plans to replace the money in his savings account at the rate of $8 per week. He has already replaced $80, which means he needs to replace $120 more to have the entire amount. Since he is replacing the money at a rate of $8 per week, he will need 15 more weeks to replace the remaining amount. Therefore, he will have to put money in his savings account for 15 more weeks to replace the entire $200 he spent on the cell phone. By doing so, he will be able to maintain his savings and avoid any financial loss.
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a pet store has 115 fish and each tank can hold six fish how many tanks do you nedd
Answer:
20 tanks
Step-by-step explanation:
if each tank holds 6 fish and there are 115 fish, you need to divide the amount of fish total by amount that go in 1 tank:
115/6 = 19.1666666667
Now we round up bc we cant leave any fish out right?
So your answer is 20 tanks will be needed to hold 115 fish if it’s 6 fish per tank.
Check this by multiplying the tanks and fish in every tank:
20 x 6 = 120
Meaning that 115 fish go into 20 tanks, one of the tanks just having 1 fish :D
Answer: 20 is the correct option.
Step-by-step explanation:Given that a pet store has 115 fish that need to be placed into fish tanks and each tank hold 6 fish.
We are to find the number of tanks that the store need.
We will be using the UNITARY method to solve the given problem.
Number of tanks needed to store 6 fishes = 1.
So, number of tanks needed to store 1 fish will be [tex]\frac{1}{6}[/tex]
Therefore, number of tanks needed to store 115 fishes is given by
[tex]\frac{1}{6}[/tex] × 155 =[tex]\frac{115}{6}[/tex]= 19 [tex]\frac{1}{6}[/tex] = 19.16.
Since we cannot have 0.16 tank, so we need one tank more than 19 to store all fishes.
Thus, the store needs 20 tanks for 115 fishes.
Hope this helps :)
Out of 300 people sampled, 33 received flu vaccinations this year. Based on this, construct a 95% confidence interval for the true population proportion of people who received flu vaccinations this year. Give your answers as decimals, to three places < p <
A 95% confidence interval for the true population proportion of people who received flu vaccinations this year is 0.067 < p < 0.133.
To construct a 95% confidence interval for the true population proportion of people who received flu vaccinations, we can use the formula:
CI = p ± z√((p(1-p))/n)
where:
CI is the confidence interval
p is the sample proportion (33/300 = 0.11)
z is the z-score associated with a 95% confidence level, which is approximately 1.96
n is the sample size (300)
Substituting the values, we get:
CI = 0.11 ± 1.96√((0.11(1-0.11))/300)
CI = 0.11 ± 0.043
CI = (0.067, 0.133)
Therefore, the 95% confidence interval for the true population proportion of people who received flu vaccinations is 0.067 < p < 0.133.
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Find the radius of the circle with equation x² + y² = 12²
Answer:
The equation of a circle with center (a,b) and radius r is given by:
(x - a)² + (y - b)² = r²
Comparing this to the equation x² + y² = 12², we can see that the center of the circle is (0,0) and the radius is 12. Therefore, the radius of the circle is 12 units.
When viewed from a distance of 32 feet from its base the top of the flagpole can be seen from the ground at an angle of elevation of 39° what is the height of the flagpole
The height of the flagpole is approximately 23.7 feet.
We can use the tangent function to solve this problem. Let's call the height of the flagpole "h". From the ground, we have a right triangle with the flagpole height as the opposite side, the distance to the flagpole as the adjacent side, and the angle of elevation as the angle opposite the flagpole height.
Using the tangent function, we can write:
tan(39°) = h/32
Solving for h, we get:
h = 32 * tan(39°)
h ≈ 23.7 feet
Therefore, the height of the flagpole is approximately 23.7 feet when viewed from a distance of 32 feet at an angle of elevation of 39°.
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Whats 4x + 5 = 6 (x + 3) - 20 - 2x
To solve this equation, we first simplify both sides of the equation by using the distributive property to expand the right-hand side:
4x + 5 = 6(x + 3) - 20 - 2x
4x + 5 = 6x + 18 - 20 - 2x
Next, we can combine like terms on the right-hand side:
4x + 5 = 4x - 2
Now, we can subtract 4x from both sides to isolate the variable on one side of the equation:
4x - 4x + 5 = 4x - 4x - 2
5 = -2
This is a contradiction since 5 cannot be equal to -2. Therefore, there is no solution to this equation.
In other words, the equation is inconsistent and there is no value of x that can make it true.
Bailey buys a car for $25,000. The car depreciates in value 18% per year. How much will the car be worth after 3 years? Round your answer to the nearest whole dollar amount.
12. [0/1 Points] DETAILS PREVIOUS ANSWERS LARCALC9 11.7. Convert the point from rectangular coordinates to spherical coordinates. (7,7, 2/7) (0, 0, 4) = ( 3V 14, 7,61.87 ). x Submit Answer
The spherical coordinates for the given rectangular coordinates (7, 7, 2/7) are (ρ, θ, φ) = (10, 45°, 88.57°) or (10, π/4, 1.545) in radians.
We'll need to find ρ (rho), θ (theta), and φ (phi) using the given rectangular coordinates (x, y, z). Here's the step-by-step process:
1. Calculate ρ (rho): ρ is the distance from the origin to the point in 3D space. You can find it using the formula: ρ = √(x² + y² + z²)
In this case, x = 7, y = 7, and z = 2/7.
Plugging these values into the formula: ρ = √(7² + 7² + (2/7)²) ρ = √(49 + 49 + 4/49) ρ = √(98 + 4/49) ρ = √(4900/49) ρ = 10
2. Calculate θ (theta): θ is the angle in the xy-plane, measured from the positive x-axis. You can find it using the formula: θ = arctan(y/x)
In this case, x = 7 and y = 7.
Plugging these values into the formula: θ = arctan(7/7) θ = arctan(1) θ = 45° (in degrees) or π/4 (in radians)
3. Calculate φ (phi): φ is the angle between the positive z-axis and the line connecting the origin to the point. You can find it using the formula: φ = arccos(z/ρ)
In this case, z = 2/7 and ρ = 10.
Plugging these values into the formula: φ = arccos((2/7)/10) φ = arccos(1/35) φ ≈ 88.57° (in degrees) or ≈ 1.545 (in radians)
So, the spherical coordinates for the given rectangular coordinates (7, 7, 2/7) are (ρ, θ, φ) = (10, 45°, 88.57°) or (10, π/4, 1.545) in radians.
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The manager of a fast-food restaurant collected data to study the relationship between the number of employees working and the amount of time customers waited in line to order. A scatter plot of the data showed a trend line with the equation y= -1. 5x+15, where y is the number of minutes a customer waits to order, and x is the number of employees working.
1. If miguel waits 6 minutes in line to order, predict the number of employees working.
2. Joni arrives to the restaurant when 8 employees are working. Predict the amount of time Jodi will wait to order.
Thank you so much in advance! I’m super confused with trend lines. Please explain how you got the answer or show your steps please! thanks!
Miguel will wait for 6 minutes in line, there are 6 employees working.
Joni will wait 3 minutes to order when 8 employees are working.
Here are the steps to answer your questions:
1. If Miguel waits 6 minutes in line to order, predict the number of employees working:
We have the trend line equation y = -1.5x + 15, where y is the waiting time in minutes, and x is the number of employees. We are given that Miguel waits for 6 minutes, so we'll plug y = 6 into the equation and solve for x:
6 = -1.5x + 15
To solve for x, first subtract 15 from both sides of the equation:
6 - 15 = -1.5x
-9 = -1.5x
Now, divide both sides by -1.5:
x = -9 / -1.5
x = 6
So, when Miguel waits 6 minutes in line, there are 6 employees working.
2. Joni arrives at the restaurant when 8 employees are working. Predict the amount of time Jodi will wait to order:
We'll use the same trend line equation and plug in x = 8 to find the waiting time for Joni:
y = -1.5(8) + 15
Multiply -1.5 by 8:
y = -12 + 15
Now, add 15:
y = 3
Joni will wait 3 minutes to order when 8 employees are working.
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Mrs. Baker conducted a survey in her classroom to determine what the students preferred to
do during the summer break. Her survey revealed that 21 out of 30 students preferred to go
swimming during the summer. If the school has a total of 1200 students, how many do
you
predict might enjoy swimming during the summer break? *
(5 Points)
To predict how many students might enjoy swimming during the summer break, we will use the information from Mrs. Baker's survey. According to her survey, 21 out of 30 students preferred to go swimming during the summer break.
Step 1: Find the fraction representing the proportion of students who preferred swimming:
21 students preferred swimming / 30 total students = 21/30
Step 2: Simplify the fraction by dividing the numerator and denominator by their greatest common divisor (GCD), which is 3:
[tex](21 ÷ 3) / (30 ÷ 3) = 7/10[/tex]
Step 3: Use the simplified fraction to predict the number of students who might enjoy swimming in a school with 1200 students:
[tex]7/10 * 1200 = (7 * 1200) / 10[/tex]
Step 4: Perform the calculations:
[tex]7 * 1200 = 8400[/tex]
8400 / 10 = 840
Your answer: Based on Mrs. Baker's survey, we predict that approximately 840 students out of the total 1200 students might enjoy swimming during the summer break.
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Suppose that a report by a leading medical organization claims that the healthy human heart beats an average of 72 times per minute. Advances in science have led some researchers to question if the healthy human heart beats an entirely different amount of time, on average, per minute. They obtain pulse rate data from a sample of 85 healthy adults and find the average number of heart beats per minute to be 76, with a standard deviation of 13. Before conducting a statistical test of significance, this outcome needs to be converted to a standard score, or a test statistic. What would that test statistic be
The test statistic (or standard score) would be 1.72.
To convert the outcome of the pulse rate data to a standard score, we would need to calculate the z-score. The formula for the z-score is: (sample mean - population mean) / (standard deviation / square root of sample size).
In this case, the sample mean is 76, the population mean (according to the report) is 72, the standard deviation is 13, and the sample size is 85. Plugging these values into the formula, we get:
(76 - 72) / (13 / sqrt(85)) = 1.72.
Therefore, the test statistic (or standard score) is 1.72. This indicates that the sample mean of 76 is 1.72 standard deviations above the population mean of 72. This information can be used to conduct a statistical test of significance and determine whether the difference between the sample mean and population mean is statistically significant.
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Function f is defined by f(x)=2x+3. Function g is defined by g(y)=y^(2)-5. What is the value of (f(3)+g(-2)) ?
A. 0
B. 1
C. 2
D. 8
E. 10
I’m having trouble with this
Which set includes ONLY rational numbers that are also integers?
The set that includes ONLY rational numbers that are also integers is:
{-3, -2, -1, 0, 1, 2, 3, ...}
Which set includes ONLY rational numbers also integers?The set of rational numbers that are also integers is the set of numbers that can be expressed as a ratio of two integers where the denominator is 1. This means that the set includes numbers that are whole numbers, as well as their negatives.Learn more about integers
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A)Irene purchased some earrings that regularly cost $55 for a friend’s birthday. Irene used a "20% Off" coupon.
How much did Irene pay for the earrings?
Show your work. Highlight your answer.
B)Irene’s friend did not like the gift so she tried to return the earrings. She did not have the receipt, so the store would only give her store credit for 50% of the purchase price.
How much credit did Irene’s friend receive?
Show your work. Highlight your answer.
C)What is the percent change from what Irene paid and what her friend returned it for?
Show your work. Highlight your answer
A) Irene pays $44 for the earrings.
B) Irene’s friend received $22 as credit.
C) Percent change from what Irene paid and what her friend returned it for is 50%
A) Cost of earing = $55
Discount coupon = 20%
Total cost Irene pay = 55 - (20% of 55)
Total cost Irene pay = 55 - ( 55 × 20/100)
Total cost Irene pay = 55 - 11
Total cost Irene pay = 44
B) Credit given by store = 50%
Credit received = 50% of 44
Credit received = 44 × 50/100
Credit received = 22
C) Percent change = [tex]\frac{final - initial }{initial}[/tex] × 100
Percent change = [tex]\frac{44-22}{44}[/tex] × 100
Percent change = 50%
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Your doing practice 6
The union set of A and B is A∪B={1, 2, 3, 4, 5, 6, 7, 9}.
Given that, A={x|x is an odd number greater than 0 and less than 10} and B={2, 3, 4, 5, 6}.
Here, set A={1, 3, 5, 7, 9}
Now, A∪B = {1, 3, 5, 7, 9}∪{2, 3, 4, 5, 6}
= {1, 2, 3, 4, 5, 6, 7, 9}
Therefore, the union set of A and B is A∪B={1, 2, 3, 4, 5, 6, 7, 9}.
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Sound travels at an approximate speed of [tex]3.43(10^2)[/tex] m/s. How far will sound travel in 2 minutes?
Answer:41,160 meters in 2 minutes at the speed of 343 meters per second.
Step-by-step explanation:
The speed of sound varies depending on the medium it's traveling through, but assuming you meant the speed of sound in air at room temperature, it's approximately 343 meters per second.
To find out how far sound will travel in 2 minutes (120 seconds), we can simply multiply the speed of sound by the time:
Distance = Speed x Time
Distance = 343 m/s x 120 s
Distance = 41,160 meters
Therefore, sound will travel approximately 41,160 meters in 2 minutes at the speed of 343 meters per second.
Shirts are packed at random in two sizes, regular and extra-large. four shirts are selected from a box of 24 and checked for size. if there are 15 regular shirts in the box, find the probability that all 4 will be regular size.
The probability that all four shirts selected from the box of 24 will be regular size is 0.1367 or 13.67%.
Probability refers to the likelihood or chance of an event occurring. In this scenario, we are interested in finding the probability that all four shirts selected from the box of 24 will be regular size.
To determine this probability, we first need to find the total number of ways in which we can select four shirts from the box. This is known as the sample space and can be calculated using the combination formula, which is nCr = n!/(r!(n-r)!). In this case, we have 24 shirts and are selecting four, so the sample space is 24C4 = (24!)/(4!(24-4)!) = 10,626.
Next, we need to find the number of ways in which we can select four regular shirts from the 15 available. This can be calculated using the same combination formula, which is 15C4 = (15!)/(4!(15-4)!) = 1,455.
Finally, we can calculate the probability of selecting all four regular shirts by dividing the number of favorable outcomes (i.e., selecting four regular shirts) by the total number of possible outcomes (i.e., the sample space). So, the probability of selecting all four regular shirts is 1,455/10,626 = 0.1367 or 13.67%.
Therefore, the probability that all four shirts selected from the box of 24 will be regular size is 0.1367 or 13.67%.
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