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. The test statistic is 2. What is the p-value?

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Since the sample size is large n 100 more than 30 the z test statistic is used even if populati... View the full answer