HW Solutions Stat 28

HW Solutions Stat 28 - Chapter 10 BUILDING THE REGRESSION...

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Chapter 10 BUILDING THE REGRESSION MODEL II: DIAGNOSTICS 10.10.a&f. i : 1 2 . . . 51 52 t i : . 224 1 . 225 . . . 1 . 375 . 453 D i : . 0003 . 0245 . . . . 0531 . 0015 t ( . 9995192; 47) = 3 . 523. If | t i |≤ 3 . 523 conclude no outliers, otherwise outliers. Conclude no outliers. b. 2 p/n = 2(4) / 52 = . 15385. Cases 3, 5, 16, 21, 22, 43, 44, and 48. c. X 0 new =[ 1 300 , 000 7 . 20 ] ( X 0 X ) 1 = 1 . 8628 . 0000 . 1806 . 0473 . 0000 . 0000 . 0000 . 0260 . 0078 . 1911 h new, new = . 01829, no extrapolation d. DFBETAS DFFITS b 0 b 1 b 2 b 3 D Case 16: . 554 . 2477 . 0598 . 3248 . 4521 . 0769 Case 22: . 055 . 0304 . 0253 . 0107 . 0446 . 0008 Case 43: . 562 . 3578 . 1338 . 3262 . 3566 . 0792 Case 48: . 147 . 0450 . 0938 . 0090 . 1022 . 0055 Case 10: . 459 . 3641
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