In order to investigate the feasibility of starting a Sunday edition for a Daily regional newspaper, information was obtained from a sample of 25 regional newspapers concerning their Daily (x) and Sunday (y) circulation (in millions of copies). Data are shown in Table 1 below.

\fd) On the basis of residual plots below, comment on the validity of simple linear regression model for these data. O O C -0.10 -0.05 0.00 0.05 0.10 0.15 Residuals O O O O O 0.2 0.3 0.4 0.5 0.6 07 Fitted values Normal Q-Q Plot O o Percent O. -0.10 -0.05 0.00 0.05 0.10 0.15