Chapter 8 HW

# Chapter 8 HW - Chapter 8 1. State whether the example is i)...

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Unformatted text preview: Chapter 8 1. State whether the example is i) Positive association, ii) Negative association, or iii) Weak association. a) Value of a computer vs. age of the computer b) Number of siblings vs. annual income c) Age of married women vs. age of their husbands 2. Given the following information on women’s heights and weights in a class, sketch a scatter plot. (Hint: This can be done by first plotting the point of averages, then using the SD’s and the correlation coefficient to draw the appropriate oval around the point of averages.) Average Height = 65 inches Average Weight = 125 pounds r = 0.45 SD of Height = 3 inches SD of weight = 10 pounds For Problems 3, 4, and 5, use the given scatter plot to estimate the five-statistic summary of the data sets (that is, estimate the average and SD for each data set and the correlation coefficient, r). Explain your answers. 3. 10.00 7.50 Y 5.00 2.50 0.00 -2.50 -5.00 2.00 4.00 6.00 8.00 X 4. 8.00 7.00 Y 6.00 5.00 4.00 3.00 2.00 4.00 6.00 8.00 10.00 X 12.00 14.00 16.00 5. 10.00 9.00 Y 8.00 7.00 6.00 5.00 4.00 -15.00 -12.00 -9.00 -6.00 -3.00 0.00 X For Problems 6-10, calculate the correlation coefficient, r, to two significant figures. 6. X 1 3 4 5 7 Y 7 5 4 3 1 X 1 3 4 5 7 Y 5 1 4 3 7 7. 8. X 1 2 3 4 5 Y −4 −6 0 −5 −6 X 9 7 4 Y 8 6 9 5 8 4 10 9. 10. X 0 2 4 6 8 Y 1 3 5 7 9 ...
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## This homework help was uploaded on 04/07/2008 for the course MATH 1680 taught by Professor Patton during the Spring '08 term at North Texas.

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Chapter 8 HW - Chapter 8 1. State whether the example is i)...

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