Question

Question 4 1 pts Classify the hypothesis test as left-tailed, right-tailed, or two-tailed. 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 Right-tailed Two-tailed O Left-tailed

Answer 1

The null and alternative hypothesis is ,

H0 :   $\mu$ = 7.2

Ha : $\mu$ < 7.2

This will be a left tailed test because the alternative hypothesis is showing a specific direction

This is the left tailed test .