Study_Resources_13 - Chapter 13 Multiple Regression Chapter...

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Chapter 13: Multiple Regression Chapter Objectives When you finish this chapter you should be able to use a fitted multiple regression equation to make predictions. interpret the R 2 and perform an F test for overall significance. test individual predictors for significance. interpret confidence intervals for regression coefficients. distinguish between confidence and prediction intervals. identify unusual residuals and outliers by using standardized residuals. interpret residual tests for leverage. analyze the residuals to check for violations of regression assumptions. explain the role of data conditioning and data transformations. Quiz Yourself True/False Questions T F 1. Multiple regression is the process of using several independent variables to predict a number of dependent variables. T F 2. For each independent variable, x i , in the multiple regression equation, the corresponding β is referred to as a partial regression coefficient. T F 3. When an additional explanatory variable is introduced into a multiple regression model, coefficient of multiple determination adjusted for degrees of freedom can never decrease. T F 4. One of the consequences of multicollinearity in multiple regression is biased estimates of the slope coefficients. T F 5. From the coefficient of multiple determination, we cannot detect the strength of the relationship between the dependent variable y and any individual independent variable. T F 6. When a dummy variable is included in a multiple regression model, the interpretation of the estimated slope coefficient does not make any sense anymore. T F 7. An interaction term in a multiple regression model involving two independent variables may be used when the relationship between 1 x and y changes for differing values of 2 x . T F 8. The Durbin-Watson d statistic is used to check the assumption of normality. T F 9. The assumption of equal standard deviations about the regression line is called residual analysis. Multiple Choice Questions
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This note was uploaded on 04/14/2009 for the course BUSINESS Res 320 taught by Professor Diaz during the Spring '09 term at University of Phoenix.

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Study_Resources_13 - Chapter 13 Multiple Regression Chapter...

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