Question

A researcher examines the factors that influence student performance. She gathers data on 224 school districts in Massachusetts. The response variable is the students’ mean score on a standardized test (Score). She uses four explanatory variables in her analysis: the student-to-teacher ratio (STR), the average teacher’s salary (TSAL), the median household income (INC), and the percentage of single family households (SGL). A portion of the data is shown in the accompanying table; the entire data set, labeled MCAS, can be found on the text website.


a. Estimate: Score = β0 + β1STR + β2TSAL + β3INC + β4SGL +  and show the regression results in a well-formatted table.
b. Evaluate the potential problems of multicollinearity and changing variability in this regressionmodel.


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  • CreatedJanuary 28, 2015
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