Question: 12.25 The following are results from a regression model analysis: yn = -3.54 + 7.4x1 14.22 + 3.2x2 10.72 + 10.1x3 113.22 R2 = 0.78

12.25 The following are results from a regression model analysis:

yn = -3.54 + 7.4x1 14.22

+ 3.2x2 10.72

+ 10.1x3 113.22 R2 = 0.78 n = 41 The numbers in parentheses under the coefficients are the estimated coefficient standard errors.

a. Compute two-sided 95% confidence intervals for the three regression slope coefficients.

b. For each of the slope coefficients test the hypothesis H0 : bj = 0

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