Question: Problem B 2. Randomly select 250 observations from the datset Salaries.csv data set and answer the fol- lowing six questions. a. Fit a multiple

Problem B 2. Randomly select 250 observations from the datset Salaries.csv data

Problem B 2. Randomly select 250 observations from the datset Salaries.csv data set and answer the fol- lowing six questions. a. Fit a multiple regression model (MOD1) to predict salary using rank, discipline, yrs.since.phd, yrs.service, and sex. b. Write out the MOD1 in equation form, being careful to handle the qualitative variables properly. c. Provide an interpretation of each coefficient in the model. d. For which of the predictors can you reject the null hypothesis Ho B=0? Why? e. Based on your response to the previous question, fit a smaller model (MOD2) that only uses the predictors for which there is evidence of association with the outcome. Write out the MOD2 in equation form. f. How well do MOD1 and MOD2 fit the data?

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