Card 48 / 104: In a career counseling session an electrical engineer mentions three jobs he has held. The fi rst paid $10 per hour, the second paid $30 per hour, and the third paid a higher rate of $50 per hour. The counselor responds that the client is averaging $30 per hour. The counselor is using
A) a Pearson product-moment correlation coeffi cie
B) a factorial design
C) the harmonic mean.
D) the mean.

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