Why does Cohen (1988) say that correlations between two variables ...

[james0929]

Why does Cohen (1988) say that correlations between two variables of .5 are about as high as they
 
  What will be an ideal response?

Question 2

Why is a Pearson's r of .6 more than twice as useful as a Pearson's r of .3?
 
  What will be an ideal response?

[Kingjoffery]

Answer to Question 1

Few variables ever show perfect correlation, especially in correlating human characteristics. Most will not be above the moderate range.

Answer to Question 2

The coefficient of determination for r = .6 shows that the variables have 36 percent of their variance in common; when r = .3, the variables have 9 percent of their variance in common. The r=.6 would be more useful for prediction.

[james0929]

Excellent

[jordangronback]

TYSM