Answers to selected problems of Chapter 3

Answers to selected problems of Chapter 3 - r : The best...

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Solution for selected problems Chapter 3 3.15 Internet use correlations: a) GDP has the strongest linear association with Internet use. b) Fertility has the weakest linear association with Internet use. c) This is a negative correlation; thus, as fertility rates increase, Internet use tends to decline. Conversely, as fertility rates decrease, Internet use tends to be greater. 3.16 Match the scatterplot with r : 1) C 2) A 3) D 4) B
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3.102 Correlate GPA and GRE: The best answer is (d). 3.103 Properties of r : The best answer is (b). 3.104 Interpreting r : The best answer is (a). 3.105 Correct statement about
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Unformatted text preview: r : The best answer is (d). 3.106 Describing association between categorical variables: The best answer is (b). 3.107 Slope and correlation: The best answer is (c). 3.108 True-false : a) False. The weakest correlation is between y and x 1. b) True. The slope and the correlation would have the same sign. c) True. The slope tells us that an increase of one year leads to a predicted increase of 0.4 thousands of dollars, which translates into $400. d) True. Ten times the slope equals four. Income is in thousands of dollars and thus, this predicted increase is $4000....
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This note was uploaded on 08/04/2011 for the course MATH 2300 taught by Professor Staff during the Spring '08 term at Texas Tech.

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Answers to selected problems of Chapter 3 - r : The best...

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