Ch. 3 HW soltion

Ch. 3 HW soltion - CHAPTER THREE Homework Solution 3.2 b x...

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Unformatted text preview: CHAPTER THREE Homework Solution 3.2 b x y xy x 2 40 83 3320 1600 30 60 1800 900 70 138 9660 4900 90 180 16200 8100 50 97 4850 2500 60 118 7080 3600 70 140 9800 4900 40 75 3000 1600 80 159 12720 6400 70 144 10080 4900 600 1194 78510 39400 ( 29 ( 29 2 2 2 1 600 10 1 39400 ) 1194 )( 600 ( 10 1 78510 1 1-- =-- = x n x y x n xy b = 2.0206 - =- = 10 600 0206 . 2 10 1194 1 x b y b = -1.836 3.3 a SIZE VALUE 4500 4000 3500 3000 2500 2000 1500 1000 500 300000 250000 200000 150000 100000 50000 Scatterplot of VALUE vs SI ZE The regression equation is VALUE = - 50035 + 72.8 SIZE Predictor Coef SE Coef T P Constant -50035 7423 -6.74 0.000 SIZE 72.820 5.225 13.94 0.000 S = 27270.3 R-Sq = 66.5% R-Sq(adj) = 66.1% Analysis of Variance Source DF SS MS F P Regression 1 1.44459E+11 1.44459E+11 194.25 0.000 Residual Error 98 72879341312 743666748 Total 99 2.17338E+11 Unusual Observations Obs SIZE VALUE Fit SE Fit Residual St Resid 76 2251 224182 113884 5571 110298 4.13R 77 1126 182012 31961 2912 150051 5.53R 78 2617 201597 140536 7298 61061 2.32RX 97 3581 242690 210735 12117 31955 1.31 X 98 4343 296251 266224 16022 30027 1.36 X R denotes an observation with a large standardized residual. X denotes an observation whose X value gives it large influence. b NUMPORTS COST 70 60 50 40 30 20 10 60000 50000 40000 30000 20000 Scatterplot of COST vs NUMPORTS The regression equation is COST = 16594 + 650 NUMPORTS Predictor Coef SE Coef T P Constant 16594 2687 6.18 0.000 NUMPORTS 650.17 66.91 9.72 0.000 S = 4306.91 R-Sq = 88.7% R-Sq(adj) = 87.8% Analysis of Variance Source DF SS MS F...
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This note was uploaded on 02/02/2012 for the course BMGT 430 taught by Professor Staff during the Spring '08 term at Maryland.

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Ch. 3 HW soltion - CHAPTER THREE Homework Solution 3.2 b x...

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