Discussion Questions and Problems Discussion Questions 4 Explain how a scatter diagram can be used to iden- 1 What is the meaning of least squares in a regression tify the type of regression to use. model? 5 Explain how the adjusted 2 value is used in devel- 2 Discuss the use of dummy variables in regression oping a regression model. analysis. 6 Explain what information is provided by the F test. 3 Discuss how the coefficient of determination and the 7 What is the SSE? How is this related to the SST and coefficient of correlation are related and how they the SSR? are used in regression analysis. 8 Explain how a plot of the residuals can be used in developing a regression model. 141