Question: Exercise 6.11 Using the following data, test the model yi j =0+1xi1+2xi2+ ei j for lack of fit. Explain and justify your method. X1 X2

Exercise 6.11 Using the following data, test the model yi j =β0+β1xi1+β2xi2+

ei j for lack of fit. Explain and justify your method.

X1 X2 Y X1 X2 Y 31 9.0 122.41 61 2.2 70.08 43 8.0 115.12 36 4.7 66.42 50 2.8 64.90 52 9.4 150.15 38 5.0 64.91 38 1.5 38.15 38 5.1 74.52 41 1.0 45.67 51 4.6 75.02 41 5.0 68.66 41 7.2 101.36 52 4.5 76.15 57 4.0 74.45 29 2.7 36.20 46 2.5 56.22

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