For each of the following eight exercises, identify: a. the population, b. the sample, c. the parameter, d. the statistic, e. the variable, and f. the data. Give examples where appropriate. 42. A fitness center is interested in the mean amount of time a client exercises in the center each week. 43. Ski resorts are interested in the mean age that children take their first ski and snowboard lessons. They need this information to plan their ski classes optimally. 44. A cardiologist is interested in the mean recovery period of her patients who have had heart attacks. 45. Insurance companies are interested in the mean health costs each year of their clients, so that they can determine the costs of health insurance. 46. A politician is interested in the proportion of voters in his district who think he is doing a good job