Chapter 13b HWquestions.docx - Chapter 13 Central Tendency...

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Chapter 13. Central Tendency and Dispersion Measures 13.9, 13.10, 13.11, 13.12 Exercise 13.9 Number of jeans =5000 + 10 amount of TV ad expenditures N=50 R-square =.72 A. The regression coefficient of 10 indicates that the number of jeans sold goes up by 10 when the amount of TV ad expenditures goes up by $1 The Y intercept is 5,000. This is the number of jeans sold when zero dollars are spent on TV ads. The R square of .72 indicates that 72 percent of the deviation in jeans sold can be explained by TV Ad expenditures B. 5000 + 100 X10 = 5000 +1000 The answer is 6000. Exercise 13.10 Number of Asthma Attacks = 5 +1 Air Pollution Scale N = 52 R-square = .6 A. Interpret the regression coefficient, y-intercept, and R-Square - The regression coefficient 1, indicates the level of air pollution goes up by 1 point, every time air pollution increases by 1 point. - The y-intercept of 5 indicates the number of student asthma cases is 5 when there is an air pollution value of 0 points. - R-squared of .6 indicates that .6 percent of the variation in the number of asthma cases is explained by the point value of air pollution.
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