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

456567546657689765432567890-9876543567890-987657890

step-by-step explanation:

60

step-by-step explanation: