Question

A researcher in the education department wants to determine if the number of hours that business students study per week at a state university varies by quarter. He conducts a survey where business students are asked how much they study per week in each of the three quarters. He defines a dummy variable Fall that equals 1 if the survey was conducted in the fall quarter and 0 otherwise. The dummy variables Winter and Spring are defined similarly.
The accompanying table shows a portion of the data for 120 students; the entire data set, labeled Study_Quarter, can be found on the text website.


a. Estimate the appropriate model to determine, at the 5% significance level, if students study the least in the spring quarter.
b. Find the predicted number of hours that students study per week in the fall and spring quarters.
c. Construct the 95% confidence interval for the expected number of hours that students study per week in the fall and springquarters.


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  • CreatedJanuary 28, 2015
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