Econ120BCh4

Econ120BCh4 - Chapter 4 Answers 4.1, 4.2, 4.3, 4.6, 4.9,...

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Chapter 4 Answers 4.1, 4.2, 4.3, 4.6, 4.9, 4.11, 4.12 1. (a) The predicted average test score is ± 5204 582 22 39236 TestScore    (b) The predicted change in the classroom average test score is ± ( 5 82 19) ( 5 82 23) 23 28 TestScore       (c) Using the formula for 0 ˆ in Equation (4.8), we know the sample average of the test scores across the 100 classrooms is 01 ˆˆ 5204 582 214 39585 TestScore CS    (d) Use the formula for the standard error of the regression (SER) in Equation (4.19) to get the sum of squared residuals: 22 ( 2) (100 2) 11 5 12961 SSR n SER  Use the formula for 2 R in Equation (4.16) to get the total sum of squares: 14088 08 . 0 1 12961 1 2 R SSR TSS The sample variance is 2 Y s 14088/99 = 142.3. Thus, standard deviation is 11.93 2. The sample size The estimated regression equation is 200. n ± 2 (215) 9941 (031)394 081 SER 102 Weight Height R     (a) Substituting inches into the equation, the predicted weights are 176.39,
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Econ120BCh4 - Chapter 4 Answers 4.1, 4.2, 4.3, 4.6, 4.9,...

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