Dataset A Dataset B O O O O O O O LO O O D D O O O O O O OO O O O O O -10 O O -10 0 20 40 60 80 0 20 40 60 80 fitted fitted Problem 3. [3 marks] The simple linear regression model y = Bo + Bix + E is fitted to Dataset A and Dataset B, respectively, and the resulting residual plots of e; vs fitted value yi are given above. (3a) [2 marks] It is known that only one of the datasets allows test on the lack-of-fit of the simple linear regression model. Which dataset is it? Briefly explain