A survey in a large unit for rst-year college students asked, \"About how many hours do you exercise during a week?\" The mean response of the 600 students was .7? = 2.2 hours. Suppose that the standard deviation of exercise time is o = 1.4- hours in the population of all rst-year students at this college. a] Find the point estimate of the mean time in exercising for a week in the population of all rst-year students at this college. b) Check conditions for a condence interval for the mean exercise time. c] Use the survey result to give a 95% confidence interval for the mean exercise time. Interpret the condence interval