HW Solutions Stat 32

HW Solutions Stat 32 - Chapter 11 BUILDING THE REGRESSION...

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Chapter 11 BUILDING THE REGRESSION MODEL III: REMEDIAL MEASURES 11.7. a. ˆ Y = 5 . 750 + . 1875 X i :1 2 3 4 5 6 e i : -3.75 5.75 -13.50 -16.25 -9.75 7.50 i : 7 8 9 10 11 12 e i : -10.50 26.75 14.25 -17.25 -1.75 18.50 b. SSR = 123 , 753 . 125, SSE =2 , 316 . 500 , X 2 BP = (123 , 753 . 125 / 2) / (2 , 316 . 500 / 12) 2 =1 . 66, χ 2 ( . 90; 1) = 2 . 71. If X 2 2 . 71 conclude error variance constant, otherwise error variance not constant. Conclude error variance constant. d. ˆ v = 180 . 1+1 . 2437 X i : 123456 weight: . 01456 . 00315 . 00518 . 00315 . 01456 . 00518 i : 7 8 9 10 11 12 weight: . 00518 . 00315
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