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source Degrees of freedom Mean  MSS ESS(X 1 ) Q1 1 MSE(X 1 )=   Q1/1 ESS(X 2 | X 1 ) Q2=Q3-Q1 1 MSE(X 2 | X 1 )=   Q2/1 ESS(X 1 , X 2 ) Q3 2 MSE(X 2 , X 1 )= Q3/2 RSS(X 1 , X 2 ) Q4=Q5-Q3 n-3 MSR(X 1 , X 2 )=   Q4/(n-3) TSS Q5 n-1

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model satisfaction Battery SMS price portable   picture Nokia 6230 68 66 75 899 69 58 Alcatel OT756 65 71 61 499 70 44 Nokia 5140 65 64 68 639 64 41 LG U8120 64 68 68 600 48 39 Nokia 3200 63 62 79 349 72 42 Nokia 6610i 63 68 70 439 77 34 Siemens S65 63 46 70 899 62 66 Motorola E398 62 80 52 599 56 58 Nokia 6600 61 58 74 799 41 58 Nokia 7610 61 58 59 899 48 63 Sagem myV-55 60 76 63 179 65 43 Siemens CX65 60 44 73 449 69 51 Panasonic X70 59 41 62 929 74 42 Siemens M65 59 45 70 649 60 50 Motorola C650 56 56 46 369 69 38 Siemens C65 55 39 67 249 71 37

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Model Variables K   R 2  adj R 2   σ F Sig. 1 None         1     3.367     2 picture         2 0.068 0.002 3.363 1.028 0.328 3 portable         2 0.006 0.065 3.475 0.080 0.781 4 battery         2 0.314 0.265 2.887 6.399 0.024 5 sms         2 0.161 0.101 3.193 2.680 0.124 6 price         2 0.150 0.089 3.213 2.467 0.139 7 picture portable       3 0.074 0.068 3.480 0.520 0.606 8 picture battery       3 0.396 0.303 2.810 4.266 0.038 9 picture sms       3 0.213 0.092 3.208 1.760 0.211 10 picture price       3 0.150 0.019 3.334 1.146 0.348 11 portable battery       3 0.314 0.209 2.995 2.977 0.086 12 portable sms       3 0.169 0.041 3.296 1.323 0.300 13 portable price       3 0.157 0.027 3.321 1.209 0.330 14 battery sms       3 0.592 0.530 2.309 9.444 0.003 15 battery price       3 0.573 0.507 2.363 8.723 0.004 16 sms price       3 0.280 0.169 3.068 2.528 0.118

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Model           k   R 2  adj R 2   σ F Sig. 17 picture portable battery     4 0.441 0.301 2.814 3.158 0.064 18 picture portable sms     4 0.214 0.018 3.336 1.092 0.390 19 picture portable price     4 0.158 0.052 3.453 0.753 0.541 20 picture battery sms     4 0.654 0.567 2.214 7.558 0.004 21 picture battery price     4 0.579 0.473 2.443 5.494 0.013 22 picture sms price     4 0.280 0.100 3.194 1.556 0.251 23 portable battery sms     4 0.593 0.491 2.402 5.819 0.011 24 portable battery price     4 0.648 0.560 2.234 7.358 0.005 25 portable sms price     4 0.283 0.103 3.188 1.576 0.247 26 battery sms price     4 0.816 0.770 1.614 17.761 0.000 27 picture portable battery sms   5 0.688 0.574 2.197 6.054 0.008 28 picture portable battery price   5 0.649 0.521 2.330 5.079 0.014 29 picture portable sms price   5 0.283 0.022 3.329 1.086 0.410 30 picture battery sms price   5 0.825 0.761 1.645 12.964 0.000 31 portable battery sms price   5 0.880 0.837 1.360 20.234 0.000 32 picture portable battery sms price 6 0.880 0.821 1.426 14.717 0.000

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R 2 Adjusted R 2 σ F sig 0.88 0.82 1.426 14.717 0.00025

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Forward Selection   Backward Elimination Stepwise Regression

R 2 Adjusted R 2 σ F sig 0.88 0.837 1.36 20.234 0.000

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Previous Current Source DF MSS Source DF MSS ESS(X 2 ) 1 MSE( X 2 ) ESS( X 2 , X 3 ) 2 MSE( X 2 , X 3 ) RSS(X 2 ) n-2 MSR( X 2 ) RSS( X 2 , X 3 ) n-3 MSR( X 2 , X 3 ) TSS n-1 TSS n-1

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log(sa/ary) =
11.19 + .0689 years+ .0126 gamesyr
(0.29) (.0121)
(.0026)
.0108
(.00110)
(.0161)
(.0072)
None of ttwse is statistically signficant when
n = 353, R2 = .6278

Multiple Regression Analysis