Please refer to the images

3. (30 points) Consider the regression model :4; = [30 + )61251 + + mm, = e where y is the observed values, 331, mack a series of nonstochastic predictors, B0, [31, \"-3161: unknown parameters, and e, a random error. f. What is the coefficient of determination R2? How is it used? g. Why is it essential to plot the residuals from the specified model? h. Can linear regression models represent non-linear relationships between the expected response and the explanatory variables