Question: Refer to Exercise 1.21 on a study comparing forced expiratory volume (y = fev1 in the data file) for three drugs (x2), adjusting for a

Refer to Exercise 1.21 on a study comparing forced expiratory volume (y =

fev1 in the data file) for three drugs (x2), adjusting for a baseline measurement

(x1).

a. Fit the normal linear model using both x1 and x2 and their interaction.

Interpret model parameter estimates.

b. Test to see whether the interaction terms are needed. Interpret using confidence intervals for parameters in your chosen model.

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