Exam 1 FALL 2011 VERSION A Solutions

# You will have to 57 66 72 77 88 92 94 96 97 98 mean

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- (you will have to count ). 55, 57, 57, 66, 72, 77, 88, 92, 94, 96, 97, 98, Mean = 129.47 104, 104, 128, 144, 149, 152, 156, 166, 171, Std. Dev. = 48.39 173, 173, 178, 181, 183, 185, 191, 197, 200: 15.  What is the variance of the data above? A. 9.23 B. 72.59 C. 2341.59*

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D. 7217.00 16. The 25 th  Percentile is: 17. The 40 th  percentile is: 18. The Median is: 19. The Z score of 66 is: A. – 1.31* B. + 1.68 C. – 0.93 D. – 1.97 20.  Using the Empirical Rule and the data above,  how many data points would  you expect/estimate to be within +2.0 and -2.0 standard deviations of the mean?
21. Using the data shown above, how many data points are  actually within   +1.0  and -1.0  standard deviations of the mean? 22.  Given the data above and looking at your statistics and using the Pearson  Skew coefficient you can say:  23. Using the data below, the Laspeyres Index for July, year 2011; using July  2006 as the base is:   Year 2006                           Year 2011            Quantity           Price/Unit Quantity Price \$US/Unit Gasoline 400       \$1.50   300                \$3.50 Oil/quart   20       \$1.00               30       \$3.00 Tires/set     1       \$350        1        \$250 A. 105.7 B. 129.4 C. 154.9 D. 176.3*

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