Answer:
the dimensions in the drawing are 16.25 inches by 6.375 inches
Step-by-step explanation:
The first thing is to use the same unit on the scale, that is, they tell us that the scale is 1:40 but that scale cannot be applied because they are different units of measurement.
The answer is preferable to give it in inches because it is more adapted to the measurements in a drawing, therefore we will pass the scale all in inches, knowing that 1 foot is 12 inches:
40 feet * 12 inches / 1 foot = 480 inches, therefore the scale is 1: 480
Now, if we pass the dimensions that give us inches, we are left with:
650 feet * 12 inches / 1 foot = 7800 inches
255 feet * 12 inches / 1 foot = 3060 inches
Now applying the scale:
7800/480 = 16.25
3060/480 = 6.375
It means that the dimensions in the drawing are 16.25 inches by 6.375 inches
Which of the following represents the graph of f(x) = 3x − 2?
graph of exponential rising up to the right, through the point 0, 3
graph of exponential rising up to the right, through the point 0, negative 1
graph of exponential rising up to the right, through the point 0, 1
graph of exponential rising up to the right, through the point 0, negative 2
Answer:
graph of exponential rising up to the right, through the point 0, negative 2
Step-by-step explanation:
I graphed the function on the graph below so you can see that it rises to the right and goes through the point (0,-2).
Answer:
graph of exponential rising up to the right, through the point 0, negative 2
Step-by-step explanation:
f(x)=3x-2
f(0)=3*0-2= -2
(0, -2) is the last given option
write -4i+(1/4-5i)-(-3/4+8i)+17i as a complex number in the standard form
Answer:
1
Step-by-step explanation:
Eliminate parentheses using the distributive property.
= -4i +1/4 -5i +3/4 -8i +17i
= (1/4 +3/4) +i(-4 -5 -8 +17)
= 1 + 0i
= 1
Bella is making button barrettes. She allows each of her friends to reach into er bag of buttons and randomly pick a color.
Answer:
Total no. of buttons = 300 + 700 + 1000
+ 500 = 2500
Possibility for a person to pick a pink button = 300/2500 = (3/25)%
Amount of pink buttons she can expect her friends to pick = 50(3/25) = 6
She can expect to make 6 pink barrettes
Step-by-step explanation:
What are the like terms in the expression below? Select two options. 3.6 p minus q minus 4 + StartFraction r over 3 EndFraction + StartFraction 3 over 7 EndFraction q
Answer:
the like terms are - q and (3/7)q
Step-by-step explanation:
3.6 p minus q minus 4 + StartFraction r over 3 EndFraction + StartFraction 3 over 7 EndFraction q = 3.6p - q- 4 + r/3 + (3/7)q
The like terms are the terms with same letters, alphabet .
For the above expression, the like terms are -q and (3/7)q
All others do not have a like term.
Answer:
-q and 3/7q btw sorry im late
Step-by-step explanation:
A homeowner finds that there is a 0.15 probability that a flashlight does not work when turned on. If she has three flashlights, find the probability that at least one of them works when there is a power failure. Find the probability that the second flashlight works given that the first flashlight works.
Answer:0.9966
Step-by-step explanation:
Given
Probability that flash light does not work is [tex]P_o=0.15[/tex]
If owner has 3 three flashlights then
Probability that atleast one of them works [tex]=1-P(\text{none of them works})[/tex]
Probability that flashlight will work [tex]=1-P_o=1-0.15[/tex]
[tex]=0.85[/tex]
Required Probability[tex]=1-0.15\times 0.15\times 0.15[/tex]
[tex]=1-0.003375[/tex]
[tex]=0.9966[/tex]
Now, Probability that second works given that first works is given by
[tex]P=P(\text{First works})\times P(\text{Second works})[/tex]
[tex]P=0.85\times 0.85[/tex]
[tex]P=0.7225[/tex]
Which of the following is a true statement for any population with mean μ and standard deviation σ? I. The distribution of sample means for sample size n will have a mean of μ. II. The distribution of sample means for sample size n will have a standard deviation of. III. The distribution of sample means will approach a normal distribution as n approaches infinity.
Answer:
I and III are true.
Step-by-step explanation:
I. The distribution of sample means for sample size n will have a mean of μ.
TRUE. The sampling distribution, or the distribution for the sample means of any size n, will have the same mean as the population.
II. The distribution of sample means for sample size n will have a standard deviation σ.
FALSE. The standard deviation of the sampling distribution depends on the sample size, with the relation:
[tex]\sigma_s=\dfrac{\sigma}{\sqrt{n}}[/tex]
III. The distribution of sample means will approach a normal distribution as n approaches infinity.
TRUE. As the sample size increases, according to the Central Limit Theorem, the sampling distribution will have approximate to a bell-shaped distribution.
If you ordered ten 20” pizzas and you lined up all the crust, would it be shorter or longer than an 18-wheeler truck (48 ft long)?
Answer:
It would me shorter by about 31.4 inches
Step-by-step explanation:
Answer:
yes (longer)
Step-by-step explanation:
20π=62.83...
62.83...x10=628.31...
628.31.../12=52.35'
step one, finding circumference.
step two multiplying circumference by 10 pizzas
step three dividing 10x circumference by 12 inches to feet.
which graph represents the compound inequality
Answer: C
Step-by-step explanation:
When looking at compound inequalities, the inequalities are very important. You can see that on the graphs, there are some points that have a white open circle and others have blue, closed circle. The 2 different circles tells you the inequality itself. If you see ≤ or ≥, it is a closed circle. This is a closed circle because it is less than/greater than or equal to. That means it is also equal to the point, therefore it is a closed circle. If you see < or >, it is an open circle. That means it is not closed because it is greater than. It is not equal to on that specific point.
Now that we have covered the basics, we can start to eliminate. our first condition is n<-2. Above, we have established that < is an open circle. We can eliminate A and B because the points on -2 are both closed circles.
That leaves us with C and D. Since C and D both follow the points, let's look carefully at what the inequality tells us. n<-2 means n is less than -2. This means the arros should be pointing in the left side. As you go more towards the negative, the smaller the number becomes.
We can eliminate D because at -2, the numbers are going towards the right, not the left.
Therefore, our answer is C.
What’s the correct answer for this?
Answer:
A 206 degrees
Step-by-step explanation:
circles have a total of 360 degrees
360-154 = 206
If this helps please consider giving me brainliest.
Answer:
206°
Step-by-step explanation:
<JLK = 360° -154 ° = 206°
Note : angle at a point is 360°.
You play a game that requires rolling a six- sided dice then randomly choosing a colored card from a deck containing 3 cards, 8 blue cards, and 6 yellow cards. Find the probability that you will roll a 2 on the dice and then choose a blue card
Answer:
4/51
Step-by-step explanation:
The probability of rolling a 2 is 1/6.
There are a total of 17 cards, so the probability of a blue card is 8/17.
The probability of both events is:
(1/6) (8/17) = 4/51
We want to find the probability of rolling a 2 and then getting a blue card. We will see that this probability is equal to 0.078
First, we must find the probability of rolling a 2 with a six-sided dice.
A six-sided dice has 6 possible outcomes, only one of these is a 2, then the probability of rolling a 2 is just:
p = 1/6
Then we find the probability of drawing a blue card.
There are:
3 cards (no color)8 blue cards6 yellow cards.So there is a total of 3 + 8 + 6 = 17 cards, and 8 of these are blue, then the probability of randomly drawing a blue card is:
q = 8/17
The joint probability is given by the product of the two individual probabilities, so we get:
P = p*q = (1/6)*(8/17) = 0.078
So the probability of rolling a 2 and then getting a blue card is P = 0.078
If you want to learn more about probability, you can read:
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What is the expasion of (2x + 3)^3 ?
Answer:
(2x + 3)3
Step-by-step explanation:
Simplify: (2x+3)(3)
Answer: (2x + 3)3
Hope this helps.
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 54 inches, and standard deviation of 8 inches. What is the probability that the height of a randomly chosen child is between 38.9 and 61 inches
Answer:
77.98% probability that the height of a randomly chosen child is between 38.9 and 61 inches
Step-by-step explanation:
When the distribution is normal, we use the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question:
[tex]\mu = 54, \sigma = 8[/tex]
What is the probability that the height of a randomly chosen child is between 38.9 and 61 inches
This is the pvalue of Z when X = 61 subtracted by the pvalue of Z when X = 38.9. So
X = 61
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{61 - 54}{8}[/tex]
[tex]Z = 0.875[/tex]
[tex]Z = 0.875[/tex] has a pvalue of 0.8092
X = 38.9
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{38.9 - 54}{8}[/tex]
[tex]Z = -1.89[/tex]
[tex]Z = -1.89[/tex] has a pvalue of 0.0294
0.8092 - 0.0294 = 0.7798
77.98% probability that the height of a randomly chosen child is between 38.9 and 61 inches
A tank contains 2840 L of pure water. A solution that contains 0.07 kg of sugar per liter enters a tank at the rate 4 L/min The solution is mixed and drains from the tank at the same rate. (a) How much sugar is in the tank initially? A(0)= 0 (kg) (b) State the rate at which the sugar is entering the tank. (kg/min) (c) State the concentration of sugar in the tank at time t, using the letter A to represent the amount of sugar in the tank at time t. (kg/L) (d) State the rate at which the sugar is leaving the tank, Rout, using the letter A to represent the amount of sugar in the tank at time t. (kg/min) (e) State the differential equation representing the rate at which the amount of sugar in the tank is changing at time t.
Answer:
(a) A(0)= 0 (kg)
(b) [tex]R_{in}=0.28\dfrac{kg}{min}[/tex]
(c) [tex]C(t)=\dfrac{A(t)}{2840}[/tex]
(d) [tex]R_{out}=\dfrac{A(t)}{710}[/tex]
(e) [tex]\dfrac{dA}{dt}=0.28-\dfrac{A(t)}{710}[/tex]
Step-by-step explanation:
A tank contains 2840L of pure water.
A solution that contains 0.07 kg of sugar per liter enters a tank at the rate 4 L/min. The solution is mixed and drains from the tank at the same rate.
(a) Amount of sugar initially in the tank.
Since the tank initially contains pure water, the amount of sugar in the tank
A(0)= 0 (kg)
(b) Rate at which the sugar is entering the tank. (kg/min)
[tex]R_{in}[/tex]=(concentration of sugar in inflow)(input rate of the solution)
[tex]=(0.07\dfrac{kg}{liter}) (4\dfrac{liter}{min})\\R_{in}=0.28\dfrac{kg}{min}[/tex]
(c) Concentration of sugar in the tank at time t
Volume of the tank =2840 Liter
Concentration c(t) of the sugar in the tank at time t
Concentration, C(t)= [tex]\dfrac{Amount}{Volume}[/tex]
[tex]C(t)=\dfrac{A(t)}{2840}[/tex]
(d) Rate at which the sugar is leaving the tank
[tex]R_{out}[/tex]=(concentration of sugar in outflow)(output rate of solution)
[tex]=\dfrac{A(t)}{2840})( 4\dfrac{Liter}{min})=\dfrac{A}{710}\\R_{out}=\dfrac{A(t)}{710}[/tex]
(e) Differential equation representing the rate at which the amount of sugar in the tank is changing at time t.
[tex]\dfrac{dA}{dt}=R_{in}-R_{out}\\\dfrac{dA}{dt}=0.28-\dfrac{A(t)}{710}[/tex]
Stanford University conducted a study of whether running is healthy for men and women over age 50. During the first eight years of the study, 1.5% of the 451 members of the 50-Plus Fitness Association died. We are interested in the proportion of people over 50 who ran and died in the same eight-year period.
Required:
a. Construct a 95% confidence interval for the population proportion of people over 50 who ran and died in the same eight-year period.
b. Explain in a complete sentence what the confidence interval means
Answer:
a. The 95% confidence interval for the population proportion of people over 50 who ran and died in the same eight-year period is (0.0038, 0.0262).
b. It means that we are 95% sure that the true proportion of people over 50 who ran and died in the same eight-year period is (0.0038, 0.0262).
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of [tex]\pi[/tex], and a confidence level of [tex]1-\alpha[/tex], we have the following confidence interval of proportions.
[tex]\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}[/tex]
In which
z is the zscore that has a pvalue of [tex]1 - \frac{\alpha}{2}[/tex].
For this problem, we have that:
[tex]n = 451, \pi = 0.015[/tex]
95% confidence level
So [tex]\alpha = 0.05[/tex], z is the value of Z that has a pvalue of [tex]1 - \frac{0.05}{2} = 0.975[/tex], so [tex]Z = 1.96[/tex].
The lower limit of this interval is:
[tex]\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.015 - 1.96\sqrt{\frac{0.015*0.985}{451}} = 0.0038[/tex]
The upper limit of this interval is:
[tex]\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.015 + 1.96\sqrt{\frac{0.015*0.985}{451}} = 0.0262[/tex]
The 95% confidence interval for the population proportion of people over 50 who ran and died in the same eight-year period is (0.0038, 0.0262).
b. Explain in a complete sentence what the confidence interval means
It means that we are 95% sure that the true proportion of people over 50 who ran and died in the same eight-year period is (0.0038, 0.0262).
how do I make more than 1 question (30 points)
CLICK ON THE POIN AND SCHROOL DOWN
Answer:
By asking the question.
Construct an equation that has k = 4 as its solution. Use k on both sides of the equation.
______=______
[tex]\frac{3}{2}k - 7 = \frac{k}{4} - 2[/tex]
Since our fractions have two different denominators of 2 and 4 in this equation, we can get rid of the fractions by multiplying both sides of the equation by their common denominator, which is 4.
So we have [tex](4)(\frac{3}{2}k - 7) = (\frac{k}{4} - 2)(4)[/tex].
Make sure you distribute the 4 through both
terms on both sides of the equation.
On the left, (4)(3/2k) is 6k and (4)(-7) is -28.
On the right, (4)(k/4) is k and (4)(-2) is -8.
So we have 6k - 28 = k - 8.
Now subtract k from both sides to get 5k - 28 = -8.
Now add 28 to both sides to get 5k = 20.
Finally, dividing both sides by 5, we find that k = 4.
Which equation represents a line that is perpendicular to the line represented by y = 2/3x+1?
An equation that represents a line that is perpendicular to the given line is [tex]2y=3x+1[/tex].
Given the following data:
[tex]y=\frac{2}{3} x+1[/tex]
To determine an equation that represents a line that is perpendicular to the given line:
The perpendicularity of a straight line.In Mathematics, the slopes of two lines are said to be perpendicular when the product of these slopes is equal to negative one (-1).
Mathematically, this is given by the formula:
[tex]m_1 \times m_2 = -1[/tex]
Note: Slope, [tex]m_1[/tex] = [tex]\frac{2}{3}[/tex]
Substituting the given parameters into the formula, we have;
[tex]\frac{2}{3} \times m_2=-1\\\\2m_2=-3\\\\m_2=\frac{3}{2}[/tex]
For the perpendicular line:
[tex]y=mx+b\\\\y=\frac{3}{2}x +1\\\\2y=3x+1[/tex]
Read more on perpendicular line here: https://brainly.com/question/20475360
What is 300+400.
I want to see how smart you are can you do this mentally????
Answer:
700
Step-by-step explanation:
Since 3 + 4 = 7, then 300 + 400 = 700
Answer: 700
Step-by-step explanation:
300+400
700
easier way to do it in your brain is
4+3 is 7 and add the 2 zeros
so the answer is 700
Hope this helps :)
I NEED HELP ASAP! Alex wants to buy carpet to cover his whole living room, except for the tiled floor. The tiled floor is 5 3/4 FT by 3 1/2 FT. WHATS THE AREA OF THE CARPET IT NEEDS TO COVER?
Answer:
53.375 or 427/8 or 53 3/8
Step-by-step explanation:
To solve this you must find the area of both the carpet and the tiled floor. You use the equation area = length x width
Carpet: 10.5 x 7 = 73.5
Tile: 5.75 x 3.5 = 20.125
The you subtract the area of the tiled floor from the carpet
73.5 - 20.125 = 53.375
(I prefer to work in decimals but most of the time they want fraction answers so 53.375 = 427/8 = 53 3/8
My rule is: y= 1/3 x+ 11/15 Find x, if y=1.
Answer:
4/5
Step-by-step explanation:
[tex]y=\dfrac{1}{3}x+\dfrac{11}{15} \\\\1=\dfrac{1}{3}x+\dfrac{11}{15}\\\\\dfrac{4}{15}=\dfrac{1}{3}x\\\\\dfrac{4}{5}=x[/tex]
Hope this helps!
Answer:
x=4/5
Step-by-step explanation:
y=1/3x+11/15
1=1/3x+11/15
4/15=1/3x
multiply both sides by 3
4/5=x
Simplify.
-2(x+3)+6x
−2(x+3)+6x
Distribute:
=(−2)(x)+(−2)(3)+6x
=−2x+−6+6x
Combine Like Terms:
=−2x+−6+6x
=(−2x+6x)+(−6)
=4x+−6
A circle has a radius of 6 cm. Which calculation would be the correct calculation to work out the circumference?
Answer: C≈ 37.7cm
Step-by-step explanation: C=2πr=2·π·6≈37.69911cm
Hope this helps.
Answer:
C = 37.7 cm
Step-by-step explanation:
Circumference = 2πr
Where r = 6 cm, π = 3.14
C = 2(3.14)(6)
C = 37.69
C ≈ 37.7 cm
For f(x) = x3 – 7x2 + 8x + 16, a. Find f(10) using synthetic division.
Answer:
Dear user,
Answer to your query is provided below
The value of f(10) using synthetic division is 396.
Explanation:
Cubic polynomials cannot be factorized by splitting the middle term. Quadratic polynomials can be factorized by splitting the middle term.
A cubic polynomial can have a maximum of three linear factors. To factorize a cubic polynomial, we first find a factor by hit and trial method or using factor theorem and reduce it into the product of a quadratic polynomial and a linear polynomial. The quadratic polynomial can then be factorized in linear factors.
The value of f(10) using synthetic division method is 396.
What is synthetic division?"The synthetic division is a method for manually performing Euclidean division of polynomials, with less writing and fewer calculations than long division."
The given function is:
f(x) = x³ – 7x² + 8x + 16
Therefore using synthetic division, we get:
(10) | (1) (- 7) (8) (16)
| (10) (30) (380)
|............................................
(396)
Therefore, f(10) = 396.
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my family left at 4am this morning on a trip to the mountains if the car average for 60 miles per hour for 600 miles what time would they arrive at their destination
Answer:
They would arrive at their destination at 2pm.
Step-by-step explanation:
We have that:
[tex]v = \frac{d}{t}[/tex]
In which v is the velocity, d is the distance and t is the time.
We first have to find how long the trip takes.
60 miles per hour, so [tex]v = 60[/tex]
600 miles, so [tex]d = 600[/tex]
Then
[tex]v = \frac{d}{t}[/tex]
[tex]60 = \frac{600}{t}[/tex]
[tex]60t = 600[/tex]
[tex]t = \frac{600}{60}[/tex]
[tex]t = 10[/tex]
The trip lasts 10 hours. Your family left at 4am. When they arrive.
10 hours after 4 am is 10 + 4 = 14 hours, which in the am/pm scale is 2 pm.
So they would arrive at their destination at 2pm.
What is the length of the hypotenuse of the triangle below?
45"
312
90°
312
O A. 6/2
O B. 3.2
O C.3
O D. 9.2
O E. 6
O F. 1
Answer:
Option (E)
Step-by-step explanation:
In the figure attached,
Given a isosceles right triangle with two equal legs measuring [tex]3\sqrt{2}[/tex] units
By Pythagoras theorem,
(Hypotenuse)² = (Leg 1)² + (Leg 2)²
Since, hypotenuse = h
Leg 1 = Leg 2 = 3√2
Now we substitute the values,
h² = (3√2)² + (3√2)²
h² = 18 + 18
h = √36
h = 6 units
Therefore, length of the hypotenuse is 6 units.
Option (E) will be the answer.
Using the Pythagorean Theorem, the length of the hypotenuse is: E. 6.
The Pythagorean TheoremGiven that the hypotenuse length of a right triangle is c, and the other legs are a and b, the Pythagorean Theorem states that: c = √(a² + b²).
Thus:
h = √((3√2)² + (3√2)²)
h = √(18 + 18)
h = √36
h = 6
Therefore, using the Pythagorean Theorem, the length of the hypotenuse is: E. 6.
Learn more about Pythagorean Theorem on:
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10. Chris Evans drives 300 miles per week in his Honda Civic that gets 22 miles per gallon of gas. He
is considering buying a new fuel-efficient car for $20,000 (after trade-in of your Honda Civic)
that gets 50 miles per gallon. Insurance premiums for the new car and old care are $900 and
$500 per year respectively. If he decides to keep his car, he will need to spend $1200 on repairs
per year. Assume gas costs $3.50 per gallon over a 5-year period.
what is the cost of the old car?
a.
b. what is the cost of the new car?
Answer:
There are 52 weeks in a year
Total of 5 years
Step-by-step explanation:
Per Week the Miles are 300 miles
Total Miles over the course of 5 years = Miles per Week * Number of Weeks in a Year * Number of Years
How did i solve this:
Total Cost of New Car = Total Cost of Gas + Total Insurance Premium + Purchase Price of New Car = 5460 + 4500 + 20,000 = $29,960
Total Cost of New Car = $29,960
Answer: = 300 * 52 * 5 = 78,000 miles in 5 years
Plz mark brainliest
Hope this helps.
6. The number of points that Kilee scored in five basketball games was 10, 10 points
8, 9, 8, and 30. Why would it be misleading to use the mean as the center
of measure for the number of points that she scored in each game? *
Answer:
Because of the presence of an outlier (30), an extremely higher value when compared to others. Outliers affects the value of mean, thereby mean should not be used for data with outliers.
Step-by-step explanation:
For the set of data above, it would be misleading to use the mean as the center of measure for the number of points that she scored in each game because of the presence of outliers, the presence of extremely lower or extremely higher value makes the use of mean as a measure of central tendency inaccurate because the mean take into consideration all the values in a data including the outliers for its calculation, and the mean would tend to shift towards the outliers thereby misinterpreting the data. The presence of outlier which is 30 in the data given would shift the mean to the right towards 30, thereby misleading to represent the measure of central tendency. 30 is an outlier because it is extremely higher than the rest of the data (10,8,9,8,30).
In the presence of outliers it's best to use median or mode as an acceptable measure of central tendency.
sing traditional methods, it takes 11.7 hours to receive a basic driving license. A new license training method using Computer Aided Instruction (CAI) has been proposed. A researcher used the technique with 23 students and observed that they had a mean of 11.3 hours with a standard deviation of 1.4. A level of significance of 0.1 will be used to determine if the technique performs differently than the traditional method. Assume the population distribution is approximately normal. Make the decision to reject or fail to reject the null hypothesis.
Answer:
The null hypothesis failed to be rejected.
There is not enough evidence to support the claim that the CAI technique performs differently than the traditional method (P-value = 0.1844).
Step-by-step explanation:
This is a hypothesis test for the population mean.
The claim is that the CAI technique performs differently than the traditional method.
Then, the null and alternative hypothesis are:
[tex]H_0: \mu=11.7\\\\H_a:\mu\neq 11.7[/tex]
The significance level is 0.1.
The sample has a size n=23.
The sample mean is M=11.3.
As the standard deviation of the population is not known, we estimate it with the sample standard deviation, that has a value of s=1.4.
The estimated standard error of the mean is computed using the formula:
[tex]s_M=\dfrac{s}{\sqrt{n}}=\dfrac{1.4}{\sqrt{23}}=0.29[/tex]
Then, we can calculate the t-statistic as:
[tex]t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{11.3-11.7}{0.29}=\dfrac{-0.4}{0.29}=-1.37[/tex]
The degrees of freedom for this sample size are:
[tex]df=n-1=23-1=22[/tex]
This test is a two-tailed test, with 22 degrees of freedom and t=-1.37, so the P-value for this test is calculated as (using a t-table):
[tex]\text{P-value}=2\cdot P(t<-1.37)=0.1844[/tex]
As the P-value (0.1844) is bigger than the significance level (0.1), the effect is not significant.
The null hypothesis failed to be rejected.
There is not enough evidence to support the claim that the CAI technique performs differently than the traditional method.
A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized below.
Men Sample size-25 Sample mean-20 Population standard deviation-5
Women Sample size-30 Sample mean-30 Population standard deviation-10
At the .01 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day? What is the value of the test statistic for this hypothesis test?
1. 2.668
2. 2.672
3. 2.58
4. 2.40
Answer:
The value of the test statistic = 2.58
Test statistic Z = - 4.805
|Z| = 4.805 > 2.58
Null hypothesis is rejected The value of the test statistic = 2.58
There is significant difference between in the mean number of times men and women send a Twitter message in a day
Step-by-step explanation:
Step(i):-
Sample size of men n₁ = 25
mean of the first sample x₁⁻ = 20
Standard deviation of the first sample σ₁ = 5
Sample size of women n₂ = 30
mean of the second sample x₂⁻ = 30
Standard deviation of the first sample σ₂ = 10
Level of significance ∝= 0.01
Step(ii):-
Null Hypothesis : H₀: There is no significant difference between in the mean number of times men and women send a Twitter message in a day
Alternative Hypothesis :H₁:There is significant difference between in the mean number of times men and women send a Twitter message in a day
Test statistic
[tex]Z = \frac{x^{-} _{1} - x^{-} _{2} }{\sqrt{\frac{S.D_{1} ^{2} }{n_{1} }+\frac{ S.D_{2} ^{2}}{n_{2} } } }[/tex]
[tex]Z = \frac{20 - 30 }{\sqrt{\frac{(5)^{2} }{25 }+\frac{ (10)^{2} }{ 30} } }[/tex]
Z = [tex]\frac{-10}{2.081} = - 4.805[/tex]
The value of the test statistic = 2.58 C
|Z| = 4.805 > 2.58
Null hypothesis is rejected The value of the test statistic = 2.58
Conclusion:-
There is significant difference between in the mean number of times men and women send a Twitter message in a day
pls help me this my my second assignment help me!!!
Answer:
Step-by-step explanation:
F/4 = 18
Multiply both sides by 4
F = 72 N
answer is A
Answer:
72N
Step-by-step explanation:
pressure=force/Area
MAKE FORCE SUBJECT OF THE FORMULA
:. FORCE=PRESSURE ×AREA
Force=18Nm² × 4m²
Force= 18N ×4
:. Force=72N
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