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PROBLEM 1: To answer questions 1-4 of the exam, use this output Table 1 for a four-variable regression analysis. (5 points each): Table 1: Regression Statistics Multiple R 0.991 R Square 0.982 Adjusted R Square 0.974 Standard Error 2.446 Observations 13 df SS MS F Sig F Regression 4 2667.90 667.97 111.48 4.8E-07 Residual 8 47.86 5.98 Total 12 2715.76 Coeff Std Error t Stat p-value Intercept 62.4 70.071 0.891 0.399 x1 1.6 0.745 2.083 0.049 x2 0.5 0.724 0.705 0.501 x3 0.1 0.755 0.135 0.896 x4 -0.1 0.709 -2.832 0.034 1. Based on = 5%, which of the four x-variables are significant? a. X(1)

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