Historically, evening long-distance calls phone calls from a
particular city have averages 12 minutes per call....
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Historically, evening long-distance calls phone calls from aparticular city have averages 12 minutes per call. In a randomsample of 20 calls, the sample mean was 10.7 minutes per call witha standard deviation of 4 minutes. Does the sample indicate achange in the mean duration of long distance calls? Test thehypothesis at 10% level of significance, state the hypothesis andreport your conclusion.
a. estimate the p-value and show your work.
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given data aresample mean 107sample sd s 4sample sizen 20here as the sample sd is
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