Question: 8. Laptops and Learning, again Refer to the data given in Exercise 16 (Section 12.3). The MINITAB printout is reproduced here a. What assumptions must

8. Laptops and Learning, again Refer to the data given in Exercise 16 (Section 12.3). The MINITAB printout is reproduced here

Regression Analysis: y versus x Analysis of Variance Source DF Adj SS

Adj MS F-Value P-Value Regression 1 3254.03 3254.03 56.05 0.000 Error 18

a. What assumptions must be made about the distribution of the random error ?

b. What is the best estimate of 2 s , the variance of the random error ?

c. Use the diagnostic plots for these data to comment on the validity of the regression assumptions.

1044.92 58.05 Total 19 4298.95 Model Summary S R-sq R-sq(adj) 7.61912 75.69%

Regression Analysis: y versus x Analysis of Variance Source DF Adj SS Adj MS F-Value P-Value Regression 1 3254.03 3254.03 56.05 0.000 Error 18 1044.92 58.05 Total 19 4298.95 Model Summary S R-sq R-sq(adj) 7.61912 75.69% 74.34%

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