Exhibit 11-2 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. At 95% confidence, the null hypothesis . a. should not be rejected b. should be revised c. should be rejected d. None of these answers are correct.

Option A , should not be rejected

Step-by-step explanation:

From the question we are told that:

Sample 1

Standard deviation 1

Sample 2

Standard deviation 2

Level of  confidence

Generally The Hypothesis are given as

Generally the equation for test Statistics is mathematically given by

Therefore

Critical Value

Where

Therefore

From Table

Therefore

Hence,We fail to reject the Null Hypothesis

Option A , should not be rejected

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step-by-step explanation:

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the correct answer is you spend $55.78 more in a brand store that buy ing in a normal store.

step-by-step explanation:

brand = spend   $ 135.85 total

store = spend $80.07 total