The waiting time to check out of a supermarket has had a population mean of 10.36 minutes. Recently, in an effort to reduce the waiting time, the supermarket has experimented with a system in which there is a single waiting line with multiple checkout servers. A sample of 60 customers was selected, and their mean waiting time to check out was 9.32 minutes with a sample standard deviation of 4.8 minutes. Complete parts (a) through (d).

1) What are the null and alternative hypotheses for this test?

A.

H0:

10.36

H1:

<10.36

B.

H0:

10.36

H1:

>10.36

C.

H0:

9.35

H1:

<9.35

D.

H0:

<9.35

H1:

9.35

E.

H0:

9.35

H1:

>9.35

F.

H0:

>10.36

H1:

10.36

2) What is the test statistic for this test? (round to four decimal places as needed)

3) What is the critical value for this test? (round to four decimal places as needed)

4) What is the conclusion for this test?

Since the test statistic is greater or less than the critical value, reject or do not reject H0. There is insufficient or sufficient evidence to conclude that the population mean waiting time to check out is less than 10.36 minutes.