End Solutions Statistics chapter 2

End Solutions Statistics chapter 2 - Chapter 2 Descriptive...

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Chapter 2 Descriptive Statistics: Tabular and Graphical Methods Learning Objectives 1. Learn how to construct and interpret summarization procedures for qualitative data such as : frequency and relative frequency distributions, bar graphs and pie charts. 2. Learn how to construct and interpret tabular summarization procedures for quantitative data such as: frequency and relative frequency distributions, cumulative frequency and cumulative relative frequency distributions. 3. Learn how to construct a dot plot, a histogram, and an ogive as graphical summaries of quantitative data. 4. Learn how the shape of a data distribution is revealed by a histogram. Learn how to recognize when a data distribution is negatively skewed, symmetric, and positively skewed. 5. Be able to use and interpret the exploratory data analysis technique of a stem-and-leaf display. 6. Learn how to construct and interpret cross tabulations and scatter diagrams of bivariate data. 2 - 1
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Chapter 2 Solutions: 1. Class Frequency Relative Frequency A 60 60/120 = 0.50 B 24 24/120 = 0.20 C 36 36/120 = 0.30 120 1.00 2. a. 1 - (.22 + .18 + .40) = .20 b. .20(200) = 40 c/d. Class Frequency Percent Frequency A .22(200) = 44 22 B .18(200) = 36 18 C .40(200) = 80 40 D .20(200) = 40 20 Total 200 100 3. a. 360° x 58/120 = 174° b. 360° x 42/120 = 126° c. d. 2 - 2 Yes 48% No Opinion 17% No 35%
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Descriptive Statistics: Tabular and Graphical Methods 0 10 20 30 40 50 60 70 Yes No No Opinion Response Frequency 4. a. Qualitative. b. Show Frequency Percent Frequency CSI 18 36% ER 11 22% Friends 15 30% Raymond 6 12% Total: 50 100 c. 0 5 10 15 20 CSI ER Friends Raymond TV Show 2 - 3
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Chapter 2 CSI 36% ER 22% Raymond 12% Friends 30% d. CSI had the largest viewing audience. Friends was in second place. 5. a. Name Frequency Relative Frequency Percent Frequency Brown 7 .14 14% Davis 6 .12 12% Johnson 10 .20 20% Jones 7 .14 14% Smith 12 .24 24% Williams 8 .16 16% 50 1.00 b. 0 2 4 6 8 10 12 14 Brown Davis Johnson Jones Smith Williams Frequency c. Brown .14 x 360 = 50.4 ° Davis .12 x 360 = 43.2 ° Johnson .20 x 360 = 72.0 ° Jones .14 x 360 = 50.4 ° Smith .24 x 360 = 86.4 ° Williams .16 x 360 = 57.6 ° 2 - 4
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Descriptive Statistics: Tabular and Graphical Methods d. Most common: Smith, Johnson and Williams 6. a. Book Frequency Percent Frequency 7 Habits 10 16.66 Millionaire 16 26.67 Motley 9 15.00 Dad 13 21.67 WSJ Guide 6 10.00 Other 6 10.00 Total: 60 100.00 with a frequency of 3, Investing for Dummies with a frequency of 2, and What Color is Your Parachute? 2000 with a frequency of 1 are grouped in the "Other" category. b. The rank order from first to fifth is: Millionaire, Dad, 7 Habits, Motley, and WSJ Guide. c.
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End Solutions Statistics chapter 2 - Chapter 2 Descriptive...

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