Suppose that a one - way analysis of variance involves four treatments but that a different number of observations (e.g., n i ) has been taken under each treatment. Assuming that n1 = 3, n2 = 2, n3 = 4, and n4 = 3, write down the y vector and X matrix for analyzing these data as a multiple regression model. Are any complications introduced by the unbalanced nature of these data?