i know that xbar is the avg of mail-orders and that ybar is the avg of bookstore.
however i'm confused as to how they got the total for (xi-xbar)(yi-ybar).
any help? thanks
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not sure where they got this equation watch
- Thread Starter
- 15-01-2010 15:39
- 15-01-2010 15:45
xi is just x really. its xi in the formula booklet for a level. my teacher said to just take it as x.
thats the sum of all the numbers take the mean squared.