Posted by Crystal on Friday, July 26, 2013 at 6:57pm.
In using repression to predict an individuals performance on the criterion based on his or her score on the instrument, the prediction is least accurate when the correlation is:
a.1.00
b. 0.00
c 0.50
d. 1.00

Statistic/Psychology  MathMate, Friday, July 26, 2013 at 7:13pm
Correlation coefficients range from 1 to +1 where the two extremes enable the researcher to make almost perfect "predictions".
On the other hand, the closer the correlation coefficient approaches zero, the less reliable would be the indication of the regression line.
Can you make a choice based on the above information? 
Statistic/Psychology  Crystal, Friday, July 26, 2013 at 7:18pm
So would the correlation be 0.00

Statistic/Psychology  MathMate, Friday, July 26, 2013 at 8:53pm
Exactly!