Walter is 10 years old and has a mental age of 8, based on the Stanford-Binet Intelligence Scale. Alfred is 12 and has a mental age of 10, based on the Stanford-Binet Intelligence Scale. Using the intelligence quotient scoring system suggested by William Stern,
A) Walter would be considered "more" intelligent than Alfred.
B) Alfred would be considered "more" intelligent than Walter.
C) both boys would be considered equally intelligent.
D) the scores cannot be meaningfully compared because the boys are not the same age.

Question

Quizplus · Accepted Answer

The intelligence quotient (IQ) is calculated by dividing mental age by chronological age and multiplying by 100. Both Walter and Alfred's IQs are below average, but Alfred's IQ is higher than Walter's (83 vs. 80) based on their respective mental ages and chronological ages. Therefore, Alfred would be considered "more" intelligent than Walter.

Walter Is 10 Years Old and Has a Mental Age