8. MCTO Section Exercise A hypothesis test is to be performed. Determine the null and alternate hypotheses. do In 1991, the average duration of long-distance telephone calls originating in one town was 6.9 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from the 1991 mean of 6.9 minutes. Ho OH:u <6.9minutes = 6.9minutes = 6.9minutes H:u> 6.9minutes = 6.9minutes H:u # 6.9minutes Ho:H + 6.9minutes = 6.9minutes

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