1. The problem statement, all variables and given/known data Does the "through-origin" least squares line yhat = b*X pass through the point (ybar, xbar)? The "through-origin" model is the least squares model without the intercept. 2. Relevant equations b = sum[YX]/sum[X^2] yhat = b*X 3. The attempt at a solution when I calculate a sample linear model yhat = b*X, ybar =/= b*xbar. The aforementioned result was obtained for two different data sets. Online it says that for: y = a + bX (xbar, ybar) does lie on the line. However, for the model in question: y = bX (xbar, ybar) does not lie on the line. I have the answer but I don't understand why it is so?