In 1990 the average duration of long distance telephone calls originated in one town was 9.6 minutes a long distant cell phone company wants to perform hypothesis test to determine whether the average duration of long distance phone calls has changed from 1990 mean of 9.6 minutes the main duration for random sample of 50 calls originate in the town was 8.8 minutes test whether the claim that the main called duration is the last day in 1990 of 9.6 minutes is supported or not supported assume that a equals 4.8 minutes... Is this claim supported or not supported