now what to do when I dont know y how I get b ?
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i'm not sure what you are asking this time, can you elaborate?
never mind, is there an easy way to find out "b" value ?
Easy way is using technology like computer software or a scientific calculator.
Difficult way is doing it by hand, not impossible but just takes a little while.
This page goes through an example. http://en.wikipedia.org/wiki/Simple_linear_regression
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