conduct a full hypothesis test and determine if the given claim is supported or not supported at the 0.05% significance level. Round all amounts and standard scores to two decimal places.

In 1990, the average duration of long-distance telephone calls originating in one town was 9.9 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 1990 mean of 9.9 minutes. The mean duration for a random sample of 50 calls originating in the town was 9.1 minutes. Test whether the claim that the mean call duration is less than the 1990 mean of 9.9 minutes is supported or not supported. Assume that a= 4.8 minutes.

A. supported

B. Not supported