The Correlation Between Score on a Test of Job Aptitude

The correlation between score on a test of job aptitude and a measure of job proficiency is +.50 among 100 employed workers. The 25 workers who scored lowest in job proficiency and the 25 who scored highest are separated from the remainder, combined in one group, and the correlation between the same two variables is recomputed. We should expect it to be

A) about the same as the first coefficient
B) higher than the first coefficient
C) lower than the first coefficient
D) different from the first coefficient, but we cannot predict whether higher or lower

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