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Name: February 13, 2001 Score:

MATH 147

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Quiz 3

(2 pts.)

Problem 1. Circle T for a true statement, F for a false statement.

T F A correlation coefficient of 0.6 means about 60% of the points in the scatter diagram are on a line.

T F After repeated measurements, you find that the scale in your local grocery store is consistently a quarter pound lighter than it should be. This is an example of chance error.

(2 pts.)

Problem 2. A sample reveals that the average female height is 63 inches with a standard deviation of 2 inches. What would the average and SD of height be in centimeters? (To convert from a measurement in inches to centimeters, multiply the measurement by 2.54)

(3 pts.)

Problem 3. The same study in problem 2 found the average female weight to be 110 pounds with a standard deviation of 6 pounds. The correlation coefficient between height and weight is 0.7. Find the weight of a female that is 60 inches tall and is on the SD line.

(3 pts.)

Problem 4. Circle the correlation coefficient that best describes the hypothetical scatter diagram below.

1.12 -0.97 0.53 -0.75 0.04