19. (i) If (13) has only one nonzero root, then B is of rank 1. In canonical form B=17/, and there then exists a vector (a1, .. . ,ap ) and constants C1' .• • , C" such that (65) (7/,,1 " '" 7/"p) = C,,( a\, ... , ap) for v = 1, .. . , r. (ii) For the s-sample problem considered in Section 4, restate (65) in terms of the means (~Ik) . . . , ~~k) of the text.