Regression Find the regression equation to predict 84 Dem from 80 Dem percentage. On a Mac, use Statistics > Regression > Simple Regression and enter the Y-variable and the X-variable in the right places. (It will look entirely wrong if you get these reversed!) Then choose (The other types of regression are studied in more advanced courses.) “Linear.” At this point, we do not do anything with either the Options or Graphs tabs along the top of the dialog box. (The Graphs tab is used when you need residual plots.) (This screen from the PC version is slightly different than the Mac version. I hope this is useful.) The result of this is a very long window of results. You’ll need to scroll down to see all of it. In the middle of it is the regression equation and at the end is a Line Plot” which is a scatterplot with “Fitted the regression line plotted on it. Here is the regression equation you are looking for: The entire output from this is on the next page. When you learn about making predictions, you should notice that the option in the menu is “Predict” greyed out. (First picture on this page, on the right-hand side.) It is not available until you have actually done the regression.
Regression Find the regression equation to predict 84 Dem from 80 Dem percentage. On a Mac, use Statistics > Regression > Simple Regression and enter the Y-variable and the X-variable in the right places. (It will look entirely wrong if you get these reversed!) Then choose “Linear.” (The other types of regression are studied in more advanced courses.) At this point, we do not do anything with either the Options or Graphs tabs along the top of the dialog box. (The Graphs tab is used when you need residual plots.) (This screen from the PC version is slightly different than the Mac version. I hope this is useful.) The result of this is a very long window of results. You’ll need to scroll down to see all of it. In the middle of it is the regression equation and at the end is a “Fitted Line Plot” which is a scatterplot with the regression line plotted on it. Here is the regression equation you are looking for: The entire output from this is on the next page. When you learn about making predictions, you should notice that the “Predict” option in the menu is greyed out. (First picture on this page, on the right-hand side.) It is not available until you have actually done the regression.
regression_first.docx