7. (3 pts) Suppose a researcher sets up an experiment and the correct model is: Yuk = [ + Ai + Bj + (AB); + Eijk where i=1,2,3,4 j=1,2,3 k=1,2 How many experimental units were used? 8. (4 pts) Suppose in a CRD with a=2 you are interested in a 95% confidence interval for 1 - M2 which is given bus y1 - y2 +/- to.025;n1+2-2 . SquareRoot [MSE( 11 + 12)] From an experimental design approach, give two ways to decrease the width of the 95% confidence interval rmed pairwise comparisons using Fisher's LSD