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Homework answers / question archive / Brooklyn College, CUNYSTAT MISC TRUE/FALSE QUESTIONS CHAPTER 7 1)The regression line is essentially an equation that expresses X as a function of Y
Brooklyn College, CUNYSTAT MISC
TRUE/FALSE QUESTIONS
CHAPTER 7
1)The regression line is essentially an equation that expresses X as a function of Y. [opposite: express Y as a function of X] -
2. Tolerance is a measure of collinearity among IVs, where possible values range from 0–1. -
3. The multiple correlation (R) is a Pearson correlation coefficient between the predicted and actual scores of the IVs. [DVs - pg 182] -
4. Interpretation of multiple regression focuses on determining the inadequacy of the regression model that has been developed. [adequacy] -
5. A secondary purpose is to use regression analysis as a means of explaining causal relationships among variables.
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6. Stepwise multiple regression is often used in studies that are explanatory in nature. [exploratory] -
7. In order to make predictions, three important facts about the regression line must be known. One of them is: The point at which the line crosses the X-axis. [Y-axis] -
8. Multicollinearity tends to increase the variances in regression coefficients, which ultimately results in a more stable prediction equation. [unstable] -
9. The coefficient of determination in multiple regression is the proportion of DV variance that can be explained by at least one IV. [by the combination of the IVs] -
10. The F test in multiple regression examines the degree to which the relationship between the IVs is linear. [between the DV and IVs - pg 182] -
11. The other main calculation in multiple regression is the determination of the value for R² and its associated significance test. -
12. Multiple regression can be very sensitive to extreme outliers. -
13. Model validation, sometimes called model cross-validation, is an important issue in multiple regression. -
14. One of the assumptions in multiple regression with regard to the raw scale variables is that the IVs are normally distributed. [fixed or measured without error or that relationship between DV and IVs is linear - pg 177] -
15. Multicollinearity is desirable in multiple regression. -
16. Another assumption in multiple regression with regard to the residuals is that the errors are correlated with the IVs. [not correlated - pg 177] -
17. Sequential multiple regression is also sometimes referred to as statistical multiple regression. [hierarchical - pg 175] -
18. Multiple regression is used to predict the value of a single DV from a weighted, linear combination of IVs. [pg172] -
19. Regression analysis procedures have as their primary purpose the development of an equation that can be used for predicting values on some DV for all members of a population. [pg 169] -
20. Partial correlation is a measure of the relationship between an IV and a DV, holding all other IVs constant. [pg 181] -
21. In standard multiple regression, the IV that has the highest correlation with the DV is entered into the analysis first. [all IVs are entered into the analysis simultaneously - pg 175] -
22. Residuals (errors of prediction) are essentially calculated as the difference between the actual value and the predicted value for the IV. [DV - pg 171] -
23. The reason that we obtain the best-fitting line as our regression equation is that we mathematically calculate the line with the smallest amount of total squared error. [pg 171] -
24. The variance inflation factor (VIF) for a given predictor “indicates whether there exists a strong linear association between it and all remaining predictors” (Stevens, 2001). [pg 174] -
25. In cases that involve moderate violations of linearity and homoscedasticity, one should be aware that these violations weaken and invalidate the regression analysis. [merely weaken, and they do not invalidate it - pg 179] -
