In 1990,the Average Duration of Long-Distance Telephone Calls Originating in One

question 18

Multiple Choice

In 1990,the average duration of long-distance telephone calls originating in one town was 7.2 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 1990 mean of 7.2 minutes.

• A)Lower-tailed
• B)Two-sided
• C)Upper-tailed

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