This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: linear) 4. Existence of strong correlation does not mean that the association is causal , that is change of one variable is caused by the change of the other (it may be third factor that cause s both variables change in the same direction) Computation y x s s n y y x x r ) 1 ( ) )( (= ∑ Where x s = standard deviation of sample x, and s y = standard deviation of sample y Example: x y (x  x ) (y  y ) Product 6 582 16 10 344 16 14 7 19 8 5 1 5 21 12 7 5 35 Sum 70 35 72 Mean 14 7 s 6.20 3.39 2 4 6 8 10 12 14 5 10 15 20 25 856 . 39 . 3 20 . 6 ) 1 5 ( 72 = × ×= r...
View
Full
Document
This note was uploaded on 07/25/2008 for the course STT 200 taught by Professor Dikong during the Summer '08 term at Michigan State University.
 Summer '08
 dikong

Click to edit the document details