QUESTION 3 Suppose that, for some linear regression model, we find that _7.2 4 3.6x and that ,-2_.81- From the choices below, select the one that is true. O The fraction of the variance in the values of y that are explained by the regression of y on x is 0.81 and r =0.9. O The fraction of the variance in the values of x that are explained by the regression of x on y is 0.81 and r= - 0.9. O The fraction of the variance in the values of y that are explained by the regression of y on x is 0.81 and = - 0.9 O The fraction of the variance in the values of x that are explained by the regression of x on y is o. g1 and =0.9