Consider the Simple Linear Regreaion model as dened in class: ya = 84] +1n+i (Model I} where the a random errors have mean zero, are honmeedastic and uncorrelated. Now. assume that we interchange the response 3:,- with the predictor 2:1 and t the following Simple Linear Regression model: I; = bu + 5135' + 8: (Model II) where the 5' random errors have mean zero, are homosoedastic and uncorrelated. (a) Derive (Le. show your work step-by-step) the Least-Squares estimators for be and in. (b) Let R? be the R3 of model I and R}, the R2 of model I]. Are they the some or not? Discnm