Each of the questions or incomplete statements below is...

Each of the questions or incomplete statements below is followed by five suggested answers or completions. Select the one that is best in each case.
Astor scores at the 84 th percentile on the WISC. Which number most closely expresses his IQ?
(A) 85
(B) 110
(C) 115
(D) 120
(E) 130

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Key Concepts

Intelligence Quotient (IQ) and Standard Scores

IQ is a standard measure used to assess human intelligence. IQ scores are standardized so that a score of 100 is average, and they are designed with a specific standard deviation (commonly 15) to enable comparisons across a population.

Percentile Ranking

A percentile indicates the percentage of scores in a norm group that an individual’s score surpasses. It provides a way of interpreting an individual’s performance relative to a broader population by showing the proportion of people who score below them.

Normal Distribution in Standardized Testing

Many standardized tests, including IQ tests, are based on the assumption that scores follow a normal distribution. This statistical property allows for the application of standard deviations and percentiles in interpreting scores, linking specific percentiles to corresponding score ranges.

Standardized Cognitive Assessments

Standardized cognitive assessments, such as the Wechsler Intelligence Scales, are used to measure various aspects of intelligence consistently. These assessments use norm-referenced scoring, which facilitates the conversion of raw scores into standard scores and percentiles for meaningful comparisons.

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