Acompany performs linear regressions to compare data sets of two similar products. if the residuals for brand a form an increasing curve, and the residuals for brand b form a u-shaped pattern, what can be concluded? a. both data sets are probably linear. b. neither data set is likely to be linear. c. brand b’s data are probably linear, while brand a’s data are probably not. d. brand a’s data are probably linear, while brand b’s data are probably not.