What is the formula for calculating Ratio IQ Score?

• A. Mental age divided by chronological age
• B. Mental age multiplied by chronological age
• C. Ratio of mental age to chronological age multiplied by 100
• D. Cognitive assessment divided by performance age

Answer: (C)

The formula for calculating Ratio IQ Score involves taking the individual's mental age and dividing it by their chronological age, and then multiplying the result by 100. This method allows for a standardized way of representing a person's intellectual functioning in relation to their age group. The multiplication by 100 serves to create a more easily interpretable score.

For example, if a child has a mental age of 10 years and a chronological age of 8 years, the calculation for the IQ score would be (10/8) * 100, resulting in a Ratio IQ of 125. This illustrates that the child performs intellectually at a level expected of someone older than their actual age, based on the ratio of mental age to chronological age.

In contrast, the other options do not accurately describe the calculation of Ratio IQ. Simply dividing or multiplying the mental age by the chronological age would not provide a standardized measure of intelligence, and assessing cognitive performance against a 'performance age' is not relevant to the Ratio IQ methodology.