QUESTION 14 In 1990, the average duration of long-distance telephone calls origi

Question

QUESTION 14 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 D Two-tailed O Right-tailed Left-tailed QUESTION 15 The owner of a football team claims that the average attendance at games is over 819, and he is therefore justified in moving the team to a city with a larger stadium. Assuming that been conducted and that the conclusion is failure to reject the null hypothesis, state the condlusion in a hypothesis test of the claim has nontechnical terms. D There is not sufficient evidence to support the claim that the mean attendance is less than 819 There is not sufficient evidence to support the claim that the mean attendance is greater than 819 t the claim that the mean attendance is less than 819. There is sufficient evidence to support the claim that the mean attendance is greater than than 819.

Explanation / Answer

Q.14> He needs to perform two-tailed test in this case, since

he wants to measure the change (which can either increase or

decrease). (Ans).

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