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The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. At the 5% significance level, it can be concluded that the mean of the population is
(a) significantly greater than 3
(b) not significantly greater than 3
(c) significantly less than 3
(d) significantly greater then 3.18
(e) None of the above

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The solution examines the population mean of a random sample of 100 customers in a grocery store.

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(a) significantly greater than 3
This is a one tail test. For 5% significance level, the critical value of z is ...

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