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Week Three Problems - Week Three Problems Narinder...

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Week Three Problems Narinder Schoeling Ashford University – Online Campus BUS 308 Statistics for Managers Professor Jake Grandy November 30, 2009
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Week Three Problems A. Chapter 7: 1. 7.10 Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of µ 12.4 percent and a standard deviation of σ 20.6 percent. Consider drawing a random sample of n = 5 stocks from the population of all stocks and calculating the mean return, , X of the sample stocks. Find the mean and the standard deviation of the sample distribution of X , and find an interval containing 95.44 percent of all possible sample mean returns. The mean is 12.4, If n=5 and N is 1815(number of stocks on New York stock exchange), then σx = - - σ5 N n N 1 = . - - 20 651815 5 1815 1 = 9.2126 (.998897) = 9.202437 And following the empirical rule that 95.44 of all possibility sample means are within pulse or minus 2 σx = 2(9.202437) = 18.40487 2. 7.22 In the July 29, 2001, issue of The Journal News (Hamilton, Ohio) Lynn Elber of the Associated Press reported on a study conducted by the Kaiser Family Foundation regarding parent’s use of television set V-chips for controlling their children’s TV
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viewing. The study asked parents who owned TV’s equipped with V-chips whether they use the devices to block programs with objectionable content.
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