Exercise 9.10.2. Show that if W1, Wr are independent with Wi W(ni, ,0), then r

Exercise 9.10.2. Show that if W1, · · ·Wr are independent with Wi ∼W(ni,Σ ,0), then rΣ

i=1 Wi ∼W

)

rΣ

i=1 ni,Σ ,0

*

.