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In 1993, the average duration of long-distance telephone calls originating in one town was 7.4 minutes. A long-distance telep
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Answer #1

Solution:
Given in the question
the average duration of long-distance telephone calls originating in one town was 7.4minutes
While our claim is whether the average duration of long-distance phone calls has changed from the 1993 means of 7.4 minutes  
So Null and Alternate hypothesis can be written as
Null hypothesis H0: \small \mu = 7.4 minutes
Alternate hypothesis Ha: \small \mu \small \neq 7.4 minutes
So its correct answer is A.

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