Assignment 4

# Assignment 4 - STAT 331/361/SYDE 334 Assignment 4 Due...

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STAT 331/361/SYDE 334 Assignment 4 Due: T uesday , April 01 , 2008 in class 1. This question refers to Q5 of Assignment 2 on an entrance test to n = 20 randomly selected students from the new freshmen class. The response variable y is the GPA at the end of the freshman year, is the entrance test score, is the score on orientation involvement and is the athletic test score. Suppose that each of the 20 students also received an overall score, based on all activities happened in the first week. The new data file is named A4 data.txt and can be downloaded from the course web page. 1 x 2 x 3 x 4 x (a) Fit a multiple regression model with all four predictors included in the model; discuss possible multicollinearity problems for the model. (b) Calculate all four variance inflation factors (VIF). Do these VIFs agree or disagree with your findings from part (a)? 2. Refer to problem #3 in Assignment #3. (a) When you analyzed this data in assignment #3 you noticed that one point is extremely far away from the rest of the data. Perform some more residual checks (look at the leverages and

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Assignment 4 - STAT 331/361/SYDE 334 Assignment 4 Due...

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