The regression equation Credits =15.0 0.08 Wark was estimated from a sample of 21 statistics students. (a-1) Calculate the residual for the x, y pair (16, 25). (Round your answer to 2 decimal places.) Residual | | (a-2) Did the regression equation underestimate or overestimate the credits? ) The regression equation overestimated the number of credits. O The regression equation underestimated the number of credits. (b-1) Calculate the residual for the x, y pair (25, 18). (A negative value should be indicated by a minus sign. Round your answer to 1 decimal place.) Resta [ (b-2) Did the regression equation underestimate or overestimate the credits? ) The regression equation overestimated the number of credits. O The regression equation underestimated the number of credits