X clear tion ed... nd 9.2 9.17 9.18 24000 Chapter 9: Section Exercises 26000 28000 30000 32000 34000 36000 AP (Example 50) Age of Used Vans The mean age of all 118 used Toyota vans for sale (see exercise 9.160) was 3.1 years with a standard deviation of 2.7 years. The distribution of ages is right-skewed. For a statistics project, a student randomly selects 35 vans from this data set and finds the mean of the sample is 2.7 years with a standard deviation of 2.1 years. a. Find each of these values: μ =? o=?x=? S = ? b. Which of the values listed in part a are parameters? Which are statistics? c. Are the conditions for using the CLT fulfilled? What would be the shape of the A approximate sampling distribution of a large number of means, each from a sample of 35 vans? Student Ages The mean age of all 2550 students at a small college is 22.8 years with a standard deviation is 3.2 years, and the distribution is right-skewed. A random sample of 4 students' ages is obtained, and the mean is 23.2 with a standard deviation of 2.4 years. a. μ =? o = ? X=? S = ? b. Is μ a parameter or a statistic? Are the conditions for using the CLT fulfilled? What would be the shape of the 489

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