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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.

A) The standardized test statistic is

B) The p-value is

C) At 95% confidence, it can be concluded that the mean of the population is:

significantly greater than 3
not significantly greater than 3
significantly less than 3
significantly greater then 3.18

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