Let Yi, Y2, , ... , Yn be an iid sample of data from the RVs Yi with finite mean and variance. Further, let X1, X2, ..., In be fixed data we wish to use to predict the yis. Further assume that we know the regression line passes through the origin. Thus, the "no-intercept" model is Yi = Bixi + Ei. Set up the estimating equation for this model. Then use it to find the OLS estimate of Bi.