Let X(i) be the design matrix with the ith row removed. Why is it true that

a. It is not true at all

b. Because c. Because

d. Because

e. Because

XX) = X X-XX! n xx = Exx; j=1 where x is the jth data row. xx = 2xx j=1 where x is the jth data row. xx = 2 x x j=1 where x is the jth data column. P xx = 2xx < j=1 where x is the jth data column.