is var(A+B)=var(A-B)? (not assuming independence) Thank you!
T taz New member Joined Feb 10, 2007 Messages 12 Apr 9, 2007 #1 is var(A+B)=var(A-B)? (not assuming independence) Thank you!
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,339 Apr 10, 2007 #2 You have an easy rule with independence, no? Var(aX+bY) = ????What? Suppose a = 1 and b = -1. What is it without independence?
You have an easy rule with independence, no? Var(aX+bY) = ????What? Suppose a = 1 and b = -1. What is it without independence?
