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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 fivestatistic 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 610, calculate the correlation coefficient, r, to two significant figures.
6.
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1 X
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10 9. 10.
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0
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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.
 Spring '08
 Patton
 Statistics

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