3.9. electricity consumption. an economist studying the relation between household electricity consumption (y) and number of rooms in the home (x) employed linear regression model (2.1) and obtained the following residuals: i: x; : e; : 2 3.2 2 3 4 5 6 7 345 6 7 8 2.9 -1.7 -2.0 -2.3 -1.2 -.9 8 9 .8 9 10 10 ~ 11 .7 .5 plot the residuals ei against xi. what problem appears to be present here? might a transformation alleviate this problem?