Why do modern-day IQ scores compare individuals of the same age group rather than using the original formula (mental age/chronological age × 100) to calculate IQ scores?
A) The original IQ formula has been corrected to eliminate cultural biases.
B) Children in the 21st century are expected to know less than children needed to know when the original IQ tests were developed.
C) Assessing intelligence in terms of mental age versus chronological age does not work well for adults.
D) Modern-day IQ scores also need to take into account children's emotional and social intelligences.

Question

Quizplus · Accepted Answer

Assessing intelligence through the ratio of mental age to chronological age becomes less meaningful as individuals grow older, because the concept of mental age does not scale in a straightforward manner into adulthood. This is why modern IQ tests compare individuals within the same age group, to provide a more accurate and meaningful measure of intelligence across all ages.

Why Do Modern-Day IQ Scores Compare Individuals of the Same