8 The variance in wait time to check out at a retail store i

8). The variance in wait time to check out at a retail store is 10 min. The store manager implements a new policy of single-line checkout and tests whether the new policy reduces wait time. the null hypothesis for this test is:

9). The fill amounts of a sample of 26 cans of apple juice show astandard deviationof 0.06 ounces. You test whether thepopulationvarianceis greater than 0.003. The p-value for this test is:

10). You want to determine whether the variance of sales at two music stores (A and B) are equal. A sample of 26 days of sales at store A provides a sample variance of 800 while a sample of 21 days of sales from store B provides a sample variance of 420.

11). Last year, the variance of the ages of the students at a small liberal arts college was 3.3 years. A recent sample of 81 students from the college provides a variance of 4.1 years. You test to see if there has been a change in the variance of the ages of the students at the college.You obtain a p-vaue of .067. At level of significance of .05, the null hypotheis should be

a.should be rejected

b. none of these answers are correct

c. should be revised

d. should not be rejected

Solution

Do you mean in #8:

\"The store manager implements a new policy of single-line checkout and tests whether the new policy reduces THE VARIANCE in wait time.\" ?

If not, I will write the answer in case the word \"VARIANCE\" is really not there.

8.

The alternative hypothesis is always the claim.

The null hypothesis is always the opposite of the claim.

Thus:

Ha = claim: variance < 10 min

Thus,

Ho: variance >= 10 min [ANSWER]

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If \"VARIANCE\" is not there:

The alternative hypothesis is always the claim.

The null hypothesis is always the opposite of the claim.

Thus:

Ha = claim: u(new) - u(old) < 0

Thus,

Ho: u(new) - u(old) >= 0 [ANSWER]

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