Historically, evening long-distance calls from a particular city have averaged 15.2 minutes per call. In a random sample of 35 calls, the sample mean time was 14.3 minutes. Assume the standard deviation is known to be 5 minutes. Using a 5% level of significance, is there sufficient evidence to conclude that the average evening long-distance call has decreased? Find the p-value.

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Reject Ho if t 1697 Fail to ... View the full answer