6. Consider the linear model Yijk Mijk + Eijk, where i = 1,2,..., I;j 1, 2, ...,J;k 1,2,. K; and the Eijk are independently distributed as N(0,0%). Let Mijk ... + (i.. - 7.) + (Thij. - Thi..) + (. - ...) + Aijk u + Qi + Bij + Yks say, where Aijk 0 (all i, j, k). (a) Find the least squares estimates of , Qi, Bij, and yk. (b) Obtain an F-statistic for testing H : di = 0 (all i)