The accompanying data file contains 20 observations on the response variable y along with the explanatory variables

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The accompanying data file contains 20 observations on the response variable y along with the explanatory variables x and d.

a. Estimate and interpret a regression model with the explanatory variables x and d. Compare the results with an extended model that also includes the interaction variable xd.

b. Use the preferred model to compute the predicted value given x = 25, and d equal to 0 and 1.

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