IQ is calculated by –
**Core Concept**
The concept of Intelligence Quotient (IQ) is a measure of human intelligence, which is a complex and multi-faceted construct. It is calculated based on an individual's performance on standardized tests designed to assess various aspects of cognitive function, such as reasoning, problem-solving, and memory.
**Why the Correct Answer is Right**
The Wechsler Adult Intelligence Scale (WAIS) is a widely used standardized test for assessing adult intelligence. It consists of several subtests that measure different aspects of cognitive function, such as verbal comprehension, visual-spatial skills, and working memory. The IQ score is calculated by comparing the individual's performance on these subtests to that of a large sample of people of the same age. The formula used to calculate IQ is: IQ = (M - A) / S, where M is the mean score of the reference group, A is the individual's age, and S is the standard deviation of the reference group. This formula allows for the calculation of an IQ score that is adjusted for the individual's age.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a widely used standardized test for assessing adult intelligence.
**Option B:** This option is incorrect because it refers to a formula that is not commonly used to calculate IQ scores.
**Option C:** This option is incorrect because it does not provide a clear explanation of how IQ is calculated.
**Clinical Pearl / High-Yield Fact**
It's worth noting that IQ scores are not a perfect measure of intelligence, and they can be influenced by various factors such as education, socio-economic status, and cultural background. However, IQ scores can provide a useful snapshot of an individual's cognitive abilities and can be used to identify potential learning difficulties or cognitive impairments.
**Correct Answer: D. The Wechsler Adult Intelligence Scale (WAIS) is a widely used standardized test for assessing adult intelligence, which calculates IQ scores using the formula: IQ = (M - A) / S.**