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Name: March 1, 2001 Score:

MATH 147

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Quiz 6

(3 pts.)

Problem 1. Circle all choices that are true. The regression line

a. is a smooth version of the graph of averages.

b. estimates the average value of y corresponding to each value of x.

c. is inappropriate for data with nonlinear associations.

(4 pts.)

Problem 2. A statistical analysis of first year GPA's and SAT scores is taken by a university admissions office. The scatter diagram of the data is football shaped. A summary of the data is:

Average GPA = 2.0 with an SD = 1.0.

Average SAT = 1000 with an SD = 125 and r = 0.6

Predict the first year GPA of an applicant that scored 1075 on the SAT.

(3 pts.)

Problem 3. The r.m.s error of the regression line is approximately (circle one)

a. 0

b. 5

c. 10

d. 20

e. 60