We are interested in determining whether the variances of the sales at two music stores (A and B) are equal. A sample of 25 days of sales at store A has a sample standard deviation of 30, while a sample of 16 days of sales from store B has a sample standard deviation of 20. The test statistic is:
a. 1.50
b. 2.25
c. 1.56
d. .67

H0:

H1:

Now we can calculate the statistic like this:

And the best option would be:

b. 2.25

Step-by-step explanation:

Information given

represent the sample size A

represent the sample size B

represent the sample deviation for A

represent the sample deviation for B

Solution to the problem

We want to test if the variation for A it's equal to the variation for B, so the system of hypothesis are:

H0:

H1:

Now we can calculate the statistic like this:

And the best option would be:

b. 2.25

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.