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HW12sol - Homework 12 Simple Linear Regression Adequacy...

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Unformatted text preview: Homework 12 Simple Linear Regression: Adequacy Checking, Correlation, Transformation The question numbers are from 5 th edition Page 1 SOLUTIONS *Use MiniTab wherever possible to check results!! *Data Sets may be found by clicking on the “Data Sets” link at: http://bcs.wiley.com/he- bcs/Books?action=index&itemId=0470053046&bcsId=5849 Question 1 11-54 Refer to the data in Exercise 11-4 on house selling price y and taxes paid x. d. What proportion of total variability is explained by the regression model? d) % 73 . 76 2 ≡ R ; Homework 12 Simple Linear Regression: Adequacy Checking, Correlation, Transformation The question numbers are from 5 th edition Page 2 Question 2 11-62 a) x y 0521753 . 677559 . ˆ + = b) : 1 = β H : 1 1 ≠ β H α = 0.05 12 , 1 , 12 , 1 , 05 . 75 . 4 9384 . 7 α f f f f = = Reject H o . c) 23842 . 25 ˆ 2 = σ d) 502 . 7 ˆ 2 = orig σ 1050 950 850 60 50 40 x y Homework 12 Simple Linear Regression: Adequacy Checking, Correlation, Transformation The question numbers are from 5 th edition Page 3 The new estimate is larger because the new point added additional variance that was not accounted for by the model....
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HW12sol - Homework 12 Simple Linear Regression Adequacy...

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