Question 1

A bank claims that the average time taken to serve a customer during lunch is4.5 minuteswith a population standard deviation of1.5 minutes. To test this claim, a randomly selected sample of64 customers is taken and the sample average is computed.

At the 1% level of significance, is there evidenceto indicate that the average customer service time during lunch hour is equal to5 minutes. Answer the question using the six-step hypothesis testing process