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# Temple - CJ 2602 - Class Notes - Week 12

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Temple - CJ 2602 - Class Notes - Week 12

##### Description: A bit short but correlation is pretty simple and straight forward
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Correlation 5 steps – just like t-test  SPSS – easiest table  Used for when both variables are ratio/scale  Variable 1: ratio/scale
Variable 2: ratio/scale
Positive correlation (both variables increase)
Negative correlation (both variables decrease)
(AT THE SAME TIME)  Step 1: state the hypothesis  o H 0  = there is no correlation between _______ and ________ o H 1  = there is a (positive/negative) correlation between _______  and ________ Step 2: df= N-2  Step 3: Need df and alpha = 0.05 (or 0.01) finding the t crit  Step 4: t – obt (always given)  Step 5: compare t-crit and t-obt  If H 1  go to Step 6: Pearson Correlation Coefficient  o = r (same as gamma/somers D)
o -1 to - .75 (strong); -.75 to -.25 (moderate); -.25 to .25 (weak); .
25 to .75 (moderate); .75 to 1 (strong)  Step 7: r 2  = coefficient of magnitude  o r X r =
o will always be positive
o convert it to a percent
o % of the change in the DV can be explained in the IV

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##### Description: A bit short but correlation is pretty simple and straight forward
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