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A local fast food restaurant claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a

A local fast food restaurant claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a standard deviation of 1 minute. The quality control department found in a sample of 50 customers that the mean waiting time was 2.75 minutes. Can we conclude that the mean waiting time is 3 minutes? Use a 0.05 level of significance.

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