The amount by which a person's performance on an IQ test differs from the norms for others in his or her age group is called ________ IQ.

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The amount by which a person's performance on an IQ test differs from the norms for others in his or her age group is called a deviation IQ. The term "deviation" refers to how much a score deviates from the average or norm. A difference or variance may also be used to describe the variation in scores, but they do not specifically refer to the individual's deviation from the norm. Performance is a broader term that can encompass many different aspects of a person's ability or achievement.

The Amount by Which a Person's Performance on an IQ