5. Sports fans are led to believe the average playing career of a running back is 4 years, however the players association believes the actual playing career to be significantly less. To test this belief, a random sample of 36 retired players were surveyed, and the average playing career was 3.64 years with a sample standard deviation of 1.21 years. Use the Hypothesis Testing procedure with a 2% level of significance to determine whether the playing career is 4 years and state a conclusion