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SW%20Ex%20Sol%20Ch4-5

# SW%20Ex%20Sol%20Ch4-5 - Stock-Watson Chapter 4 5 Solutions...

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1 Stock-Watson Chapter 4 & 5: Solutions to Selected Exercises Chapter 4 4.1. (a) The predicted average test score is ° 520 4 5 82 22 392 36 TestScore = . - . × = . (b) The predicted change in the classroom average test score is ° ( 5 82 19) ( 5 82 23) 23 28 TestScore Δ = - . × - - . × = . (c) Using the formula for 0 ˆ β in Equation (4.8), we know the sample average of the test scores across the 100 classrooms is 0 1 ˆ ˆ 520 4 5 82 21 4 395 85 TestScore CS β β = + × = . - . × . = . . 4.2. The sample size 200. n = The estimated regression equation is g1849g1857g2835g1859g1860g1872 g3555 g3404 g3398uni0039uni0039uni002Euni0034uni0031g3397uni0033uni002Euni0039uni0034 g3400g1834g1857g1861g1859g1860g1872uni002C g1844 g2870 g3404uni0030uni002Euni0038uni0031uni002C g1845g1831g1844g3404uni0031uni0030uni002Euni0032 (a) Substituting 70, 65, and 74 Height = inches into the equation, the predicted weights are 176.39, 156.69, and 192.15 pounds. (b) ° 3 94 3 94 1 5 5 91. Weight Height Δ = . × Δ = . × . = . (c) We have the following relations: 1 2 54 and1 0 4536 . in cm lb kg = . = . Suppose the regression equation in the centimeter-kilogram space is ° 0 1 ˆ ˆ Weight Height γ γ = + .

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SW%20Ex%20Sol%20Ch4-5 - Stock-Watson Chapter 4 5 Solutions...

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