If IQ was measured on a ratio scale, and John had an IQ of 40 and Fred an IQ of 80, it would be correct to say that Fred was twice as intelligent as John.

Question

Quizplus · Accepted Answer

IQ is measured on an interval scale, not a ratio scale. On an interval scale, the differences between the values are meaningful, but the zero point is arbitrary. This means that it is not possible to say that one person is twice as intelligent as another person based on their IQ scores.

If IQ Was Measured on a Ratio Scale, and John