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Name: February 15, 2001 Score:

MATH 147

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Quiz 4

(4 pts.)

Problem 1. A study reveals that the average male height is 68 inches with a standard deviation of 2.5 inches. The same study found the average male weight to be 144 pounds with a standard deviation of 18 pounds. The correlation coefficient between height and weight for this study is 0.8. Find the height of a male that is 180 pounds and is on the SD line.

(3 pts.)

Problem 2. For the scatter diagram below: (Circle the appropriate answer)

a. The average of x is around: 3 5 7 9 11

b. The SD of x is around: -2 0 2 4 9

c. The correlation is: positive negative nearly zero not enough data to tell.

(3 pts.)

Problem 3. Circle the correlation coefficient that best describes the hypothetical scatter diagram below.

1.12 -0.97 0.68 -0.25 0.04