statistics homework 7.docx

# statistics homework 7.docx - Homework 7-A stepwise...

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Homework 7 -A stepwise regression search procedure stops when ______ no more significant independent variables remain outside of the model - Which of the following iterative search procedures for model-building in a multiple regression analysis reevaluates the contribution of variables previously include in the model after entering a new independent variable? Stepwise regression - Which of the following iterative search procedures for model-building in a multiple regression analysis starts with all independent variables in the model and then drops non-significant independent variables is a step-by-step manner? Backward elimination -Which of the following iterative search procedures for model-building in a multiple regression analysis adds variables to model as it proceeds, but does not reevaluate the contribution of previously entered variables? Forward selection - An "all possible regressions" search of a data set containing 7 independent variables will produce ______ regressions. 127 -An "all possible regressions" search of a data set containing 5 independent variables will produce ______ regressions. 31 -An "all possible regressions" search of a data set containing " k " independent variables will produce __________ regressions. 2 k – 1 -Inspection of the following table of correlation coefficients for variables in a multiple regression analysis reveals that the first independent variable entered by the forward selection procedure will be ___ y x 1 x 2 x 3 x 4 x 5 y 1 x 1 -0.1661 1 x 2 0.231849 -0.51728 1 x 3 0.423522 -0.22264 -0.00734 1 x 4 -0.33227 0.028957 -0.49869 0.260586 1 x 5 0.199796 -0.20467 0.078916 0.207477 0.023839 1 ________. x

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