Question

Access the data, labeled Professor_Salary, from the text website. These data were used in the introductory case of this chapter. Recall that we estimated our preferred model as  = 39.43 + 1.24x + 13.89d, where y represents salary (in $1,000s), x represents experience (in years), and d is a gender dummy variable that equals 1 for male and 0 for female.
a. Use the preferred model to construct the 90% prediction interval for the salary of a male professor with 20 years of experience.
b. Use the preferred model to construct the 95% prediction interval for the salary of a male professor with 20 years of experience.
c. Comment on the width of the above prediction intervals.



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  • CreatedJanuary 28, 2015
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