TESTING AND INDIVIDUAL DIFFERENCES
THE DYNAMICS OF INTELLIGENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Approximately two-thirds (68%) of all scores on standardized IQ tests such as the WAIS fall between ____ and ____, a range that is considered to indicate normal or average intelligence.
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100;150
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50;150
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85;115
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70;130
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Explanation:
Detailed explanation-1: -Based on the 68-95-99.7 Rule, approximately 68% of the individuals in the population have an IQ between 85 and 115.
Detailed explanation-2: -Let’s return to the example of IQ scores and find the 33rd percentile for IQ scores when = 100 and = 16. Thus, 92.96 is the 33rd percentile for IQ scores.
Detailed explanation-3: -The range of possible WAIS-IV full scale IQs is 45–155. The WAIS-IV computes scaled scores for each individual based exclusively on chronological age.
Detailed explanation-4: -The two-standard-deviations rule implies that about 5 percent of the population have IQ scores more than 30 points away from 100: 2.5 percent above 130 and 2.5 percent below 70. 3.
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