Describe an example of a research question where a Regression Model could be

 
Describe an example of a research question where a Regression Model could be or had been used. Describe the characteristics of the independent variables and their likelihood of explaining the variance in the dependent variable. Discuss your estimate what you would expect the correlation coefficient to be between the pairs of each independent variable and the dependent variable.
Discuss how r2 is valuable in determining the effectiveness of the regression model.