a. Compute the three sums of squares, SST, SSR, and SSE, using the defining formulas. SST= (Type an integer or a decimal.) SSR= (Type an integer or a decimal.) SSE= (Type an integer or a decimal.) b. Verify the regression identity, SST =SSR+SSE. Is this statement correct? Yes No c. Determine the value of r2, the coefficient of determination. r2= (Round to four decimal places as needed.) d. Determine the percentage of variation in the observed values of the response variable that is explained by the regression. % (Round to two decimal places as needed.) e. State how useful the regression equation appears to be for making predictions.