How can one measure intelligence? One way is to measure the size of the brain. New technology makes it possible to measure the volume of a person's brain in cubic inches without injury. What is more, the measurement gives close to the same answer when one repeats it. But how big the brain is has no relation to how smart a person is. As a measure of intelligence, brain volume is:
A) reliable but invalid.
B) valid but not reliable.
C) valid and reliable.
D) not reliable and invalid.

Question

Quizplus · Accepted Answer

While brain volume is a reliable measure in terms of consistency between measurements, it is not a valid measure of intelligence as there is no direct correlation between brain size and intelligence. Therefore, it is reliable in the sense that it is consistent but invalid as a measure of intelligence.

How Can One Measure Intelligence? One Way Is to Measure