The formula which uses chronological age (CA) and mental age (MA) to calculate the intelligence quotient is:
A) MA ? CA ? 100.
B) CA ? MA ? 100.
C) (MA ? CA) ? 100.
D) 100 ? (MA + CA).
Answer: A
Rationale: William Stern developed the intelligence quotient (IQ)—a measurement in which the mental age of an individual is divided by the person's chronological age and then multiplied by 100.
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