Two high schools have a similar number of students and parking lots of similar size. The safety officers at both schools want to investigate whether there is an average difference in the number of cars parked per day in the student parking lots for the school year. A random sample of 15 school days will be selected. For each selected day, the number of cars parked in the student parking lots will be counted at both schools and the difference will be recorded. Assuming all conditions for inference are met, which of the following is the appropriate test for the investigation?
a. A two-sample 2-test for a difference between proportions
b. A two-sample t-test for a difference between means
c. A matched-pairs t-test for a mean difference
d. A chi-square test of homogeneity
e. A chi-square test of independence

Answer:

Solution given:

x+120°=180°[linear pair][supplementary]

x=180°-120=60°

x=60° is your answer

Answer:

It's totally correct with no doubt

Answer:

15.71 cubic inches

257.41 cm³

0.26 liters

Step-by-step explanation:

Answer:

base=area=1/2b×h

Step-by-step explanation:

it's a pleasure to help you goodbye. if I'm wrong tell me right away.

Answer:

he needs 500 cm of ribbon

Step-by-step explanation:

pieces cut =10

size of pieces = 50 cm each .

50 × 10 = 500 answers

the awnser is graph A.

you find the two point that the line is going through and count the squares going up (rise) and count the squares going a cross (run). and that is the slope and the -3 is where the point is on the y intercept

Answer:

solution:

the measure of arc AD

:

arc AD+arc CD=180° linear pair

arc AD=180-45=135°

the measure of arc AD=135 degree

Answer:

A

Step-by-step explanation:

Just took the test

The statement that asserts a true claim would be:

A). The height is approximately r units and the base length is approximately πr units.

The sector is described as an element of the circle or a part that extends to the center.

In the given figure, the height of the congruent sectors would be equivalent to r units as the radius is r units.

While the length of its base would be equivalent to πr units to denote the base length.

Thus, option A is the correct answer.

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Answer:

$17,440

Step-by-step explanation:

the interest every year

=$16,000×3%

=$16,000×3/100

=$480

the balance after 3 years

=$16,000+3($480)

=$16,000+$1,440

=$17,440

Answer:

The answer to this question is 4.

answer:

14 30

Step-by-step explanation:

208/32=6.5

6.5 hours is 6 hours 30 min

08 00 + 6h 30min =14 30/2.30

The ferry reached its destination at approximately 14:30 or 2:30 PM.

To determine the time the ferry reached its destination, we need to divide the distance traveled by the average speed of the ferry.

Distance traveled = 208 km

Average speed = 32 km/h

Time = Distance / Speed

Time = 208 km / 32 km/h

Calculating this, we find:

Time = 6.5 hours

Since the ferry started its journey at 08:00, we can add 6.5 hours to that time to determine the arrival time.

08:00 + 6.5 hours = 14:30

Therefore, the ferry reached its destination at approximately 14:30 or 2:30 PM.

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Answer:

16

Step-by-step explanation:

Answer:

16 feet is the length.

Step-by-step explanation:

The area of a rectangle is A = L x W

If we know the area then:

208 = L x 13

208/13 = L

L= 16 feet

Answer:

c,e,f,

Step-by-step explanation:

The answer for this question is C, E and F .

Given that the length is 3 times the width. So firstly, you have to find the expression of length :

Let width = w,

Next, the perimeter of rectangle is P = 2(length+width) so you have to substitute the expression into the formula :

Let length = 3w

Let width = w,

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may i please have a branllist

Answer:

430

Step-by-step explanation:

The "product" means multiply

215*2=430 or you can break it up:

215+215=430

Answer: 430

→Hope this helps!←

O s

Step-by-step explanation:

The first fraction has the smallest value

answer

B)34.85°

ur very welcome

Answer:

34.85°

Step-by-step explanation:

Hello, just got done with this exam and got the answer correct!

Answer: A- she can not mow 1 and 1/4 in an hour.

Step-by-step explanation:

set up a ratio

[tex]\frac{.5}{25} =\frac{x}{60}[/tex] (1/2 acre is 25 minutes, x acre in 60 minutes)

cross multiply to solve

.5(60)=25x

30=25x

1.2=x- she can mow 1.2 acres in 60 minutes, 1.2= [tex]1\frac{1}{5}[/tex]

Answer:

This answer is A

Step-by-step explanation:

Just believe me its the right answer

Answer:

B) 40 yd²

Step-by-step explanation:

Square = 4x4=16

Triangle = 1/2x6x8=24

16+24=40 yd²

Answer:

The answer is B, 40yd2

Step-by-step explanation:

hope this helps

Answer:

third option

Step-by-step explanation:

the median - of 6 - divides the data set into halves (theoretically, number of cousins is 50% less than 6 and 50% more than 6)

Answer:

Step-by-step explanation:so you have to divide

Answer:

5

Step-by-step explanation:

if u add al of these it equals 35 divided by 7 equals 5

Answer:

The 98% confidence interval for the mean magnesium ion concentration is between 122 ppm and 220 ppm. As the lower bound of the interval is below 195, it is not reasonable to conclude that the mean magnesium ion concentration may be greater than 195

Step-by-step explanation:

The six measurements are:

202, 164, 157, 177, 113, 213

Sample mean:

Sum of all values divided by the number of values which is 6. So

[tex]S_m = \frac{202+164+157+177+113+213}{6} = 171[/tex]

Sample standard deviation:

Square root of the difference squared between each value and the mean, and divided by 1 subtracted by the sample size. So

[tex]s = \sqrt{\frac{(202-171)^2+(164-171)^2+(157-171)^2+(177-171)^2+(113-171)^2+(213-171)^2}{5}} = 35.69[/tex]

Confidence interval

We have the standard deviation for the sample, which means that the t-distribution will be used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 6 - 1 = 5

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 5 degrees of freedom(y-axis) and a confidence level of [tex]1 - \frac{1 - 0.98}{2} = 0.99[/tex]. So we have T = 3.365

The margin of error is:

[tex]M = T\frac{s}{\sqrt{n}} = 3.365\frac{35.69}{\sqrt{6}} = 49[/tex]

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 171 - 49 = 122 ppm

The upper end of the interval is the sample mean added to M. So it is 171 + 49 = 220 ppm

The 98% confidence interval for the mean magnesium ion concentration is between 122 ppm and 220 ppm. As the lower bound of the interval is below 195, it is not reasonable to conclude that the mean magnesium ion concentration may be greater than 195

Answer:

[tex](x - 2)^2 + (y +4)^2 = 25[/tex]

Step-by-step explanation:

Given

[tex](h,k) = (2,-4)[/tex] --- center

[tex]r = 5[/tex] --- radius

Required

Determine the equation

The equation of the circle is:

[tex](x -h)^2 + (y - k)^2 = r^2[/tex]

From the given parameters, we have:

[tex]h = 2[/tex]

[tex]k = -4[/tex]

[tex]r = 5[/tex]

So:

[tex](x -h)^2 + (y - k)^2 = r^2[/tex]

[tex](x - 2)^2 + (y --4)^2 = 5^2[/tex]

Express -- as +

[tex](x - 2)^2 + (y +4)^2 = 5^2[/tex]

Evaluate the squares

[tex](x - 2)^2 + (y +4)^2 = 25[/tex]

A function is even if f(x)=f(-x), and odd if f(x)=-f(-x). If a function satisfies neither of these, it is neither even nor odd.

[tex]f(x)=-3x+1\\f(-x)=-3(-x)+1=3x+1[/tex]

Since f(x) is equal to neither f(-x) nor f(-x), the function is neither even nor odd.

Answer:

A. {All Integers}, because it will go on forever

Answer:

A) 0.01

B) 0.07

Step-by-step explanation:

We are given;

P(accidents last year) = 0% = 0

P(accidents this year) = 6% = 0.06

P(accidents last year | accidents this year) = 10% = 0.1

A) We want to find the percentage of the employees will experience lost-time accidents in both years.

From multiplication rule in probability, we know that;

P(A & B) = P(A) × P(B|A) = P(B) × P(A|B)

Thus;

P(accident in both years) = P(accidents this year) × P(accidents last year | accidents this year)

P(accident in both years) = 0.06 × 0.1

P(accident in both years) = 0.006

To 2 decimal places gives; 0.01

B) from the addition rule, we know that;

P(A or B) = P(A) + P(B) - P(A & B)

Thus;

P(accident last year or this year) = P(accidents last year) + P(accidents this year) - P(accident in both years)

P(accident last year or this year) = 0 + 0.06 + 0.006 = 0.066

To 2 decimal places = 0.07

Answer:

gfddgjjjffdbbshshhshshshhshhbsbdbddbdvbd

Answer:

girls 57/100 57% 0.57

Step-by-step explanation:

boys 43/100 43% 0.43

all the ways

The portion of girls in the fourth grade class will be 57/ 100 and in the decimal form it will be 0.057.

It is given that there are total 100 students at a school in fourth grade out of which 57 are girls.

We have to find out the portion of girls in the fourth grade class and express it to decimal.

What is the decimal fractions ?

Decimal fractions are the fractions in which the denominator must be 10 or a multiple of 10 i.e., 100, 1000, 10000, and so on.

As per the question ;

57 are girls out of total 100 students in a class at a school.

The number of boys will be ;

= 100 - 57 = 43

The no. of girls in fraction form will be ;

= 57 / 100

and in the decimal form it will be ;

= 0.057

The no. of boys in decimal form will be ;

= 47 / 100

= 0.047

Thus , the portion of girls in the fourth grade class will be 57/ 100 and in the decimal form it will be 0.057.

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