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 = ?0 + ?1STR + ?2TSAL + ?3INC + ?4SGL + 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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