Exam 2 Answers

Exam 2 Answers - Stat 145: Exam 2 Review Answers 1. (a) The...

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1. (a) The correlation will be closer to 1, as this observation clearly falls outside of the linear pattern of the remaining observations. (b) No the correlation would not change, as the correlation does not depend on the units of measurement. 2. The population size was also increasing, thus it would be expected that the number of crimes would increase as well. 3. (a) There is a moderately strong positive linear association between the two vari- ables. (b) The response variable ( y ) is relative mortality rate and the explanatory variable ( x ) is relative smoking rate. The slope is: b = r ± s y s x = 0 . 716 ± 26 . 1 17 . 2 = 1 . 0865 The intercept is: a = ¯ y - b ¯ x = 109 - 1 . 0865(103) = - 2 . 9095 The least-squares regression equation is: ˆ y = - 2 . 9095 + 1 . 0865 x (c) The predicted value is: ˆ y = - 2 . 9095 + 1 . 0865(110) = 116 . 6055 4. (a) False; points that lie above the least-squares regression line will have positive residuals. (b) True
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This homework help was uploaded on 04/02/2008 for the course STAT 145 taught by Professor Allstats145 during the Summer '07 term at New Mexico.

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Exam 2 Answers - Stat 145: Exam 2 Review Answers 1. (a) The...

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