AP Statistics Question (This was on one of my class tests)

matty7589
Thu, 08 Feb 2007 15:46:58 +0000

also, dont forget:

r = 1/(n-1)* sum((x-xbar)/stand. dev x)(y - ybar)/stand dev. y))

if all the y values are same, standard dev = 0 and you cannot divide by a zero.