A nationwide clothing store has found that the average customer wait time to get checked out is 9 minutes with a population standard deviation of 2 minutes. A branch manager has hired more personnel in order to reduce the amount of customer wait time. He takes a random sample of 50 customers and finds that the average wait time is 8 minutes.   Calculate the test statistic. (Round your answer to two decimal places.)     Based on  ? = 0.01,  what is the correct conclusion for the hypothesis test?

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