147Fall97-test2

# 147Fall97-test2 - Top Math 147 - Fall 1997 - Test # 2 Name:...

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Top Math 147 - Fall 1997 - Test # 2 Name: _______________________________________ Section Number: _____________________ Show ALL your work. Solutions with no work will receive NO credit. NEATNESS COUNTS! If you need extra paper, use the back page or raise your hand and ask one of the proctors for some. A normal table is provided at the end of the test. For questions 1 - 8 circle the answer which best completes the sentence. ( 3 points each) 1. In a regression setting for predicting y from x, a correlation coefficient of zero means, a. the R.M.S. error is equal to the SD of x. b. there is no relationship between the variables. c. the slope of the regression line is zero. d. the slope of the SD line is zero. e. both (b) and (c). 2. In a regression setting for predicting y from x a correlation coefficient of - 0.92 indicates, a. x and y have a strong linear relationship. b. large values of x are generally associated with large values of y. c. large values of x are generally associated with small values of y. d. both (a) and (b). e. both (a) and (c). 3. You are told by a scientist that fitting a regression line to her research was appropriate. You expect, a. the residual plot of the regression shows no pattern. b. the regression line for the residuals has the same slope as the SD line. c. the value of r for her data set was very close to 1 or - 1. d. her scatter diagram contains two distinct clusters of points. e. none of the above. 4. Consider the following statements about a regression setting for predicting y from x: I. The units for the correlation coefficient are the same as the units of y. II. The correlation coefficient will not change if all the values of one variable are multiplied by - 1. III. The units for the R.M.S. error are the same as the units of x. IV. If the x and y variables are switched then the value of the correlation coefficient changes sign. Then we know, a. I and II are true. b. II and IV are true.

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c. II and III are true. d. all of the above statements are true. e. none of the above statements are true. 5.
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## This note was uploaded on 05/27/2008 for the course MATH 147 taught by Professor Klimko during the Fall '07 term at Binghamton.

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147Fall97-test2 - Top Math 147 - Fall 1997 - Test # 2 Name:...

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