Z test for population mean

The mean waiting time for the
drive-through window of a fast-food franchise is believed to be 3.7 minutes. A
manager wants to check the time at her particular restaurant. A sample of 75
customers is selected and the sample mean waiting time is 3.57 minutes with a
sample standard deviation of 0.8 minutes. Is there evidence that the waiting
time at this particular restaurant is less than 3.7 minutes? Use a 1% level of
significance. What is your conclusion?

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