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Use the computer output from Problem 12 in Chapter 8 and the output given hereto answer the following questions.

a. State the model that relates change in refraction (Y) to baseline refraction (X1), baseline curvature (X2), and the interaction of X1 and X2. Is the partial F test for the interaction significant?

b. Is it appropriate to assess confounding given your answer to part (a)? Explain.

c. If your answer to part (b) is yes, does X2 confound the relationship between Y and X1?

d. If your answer to part (b) is yes, does X1 confound the relationship between Y and X2?

e. In light of your answers to parts (a) through (d), and on considerations of precision, which predictor(s) should be included in the model?

a. State the model that relates change in refraction (Y) to baseline refraction (X1), baseline curvature (X2), and the interaction of X1 and X2. Is the partial F test for the interaction significant?

b. Is it appropriate to assess confounding given your answer to part (a)? Explain.

c. If your answer to part (b) is yes, does X2 confound the relationship between Y and X1?

d. If your answer to part (b) is yes, does X1 confound the relationship between Y and X2?

e. In light of your answers to parts (a) through (d), and on considerations of precision, which predictor(s) should be included in the model?

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