Classify the hypothesis test as two-tailed, left tailed, or right 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 if 7.2 minutes. Answer choices: A) two-tailed B) left-tailed C) right-tailed