COGNITION
THINKING AND LANGUAGE
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[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Detailed explanation-1: -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.
Detailed explanation-2: -One standard deviation is the range which includes 65% of all scores, two standard deviations includes 95% of all scores. By definition, gifted is considered to be two standard deviations or above on a standard measure of intelligence. This equates to IQ = 130 or above, for measures with a standard deviation of 15.
Detailed explanation-3: -0.13% of the population is more than three standard deviations below the mean (IQ <55), and 0.13% of the population is more than three standard deviations above the mean (IQ 145-160). Thus, 13 out of 10, 000 individuals score above 145 and are considered profoundly gifted.
Detailed explanation-4: -One example of a variable that has a Normal distribution is IQ. In the population, the mean IQ is 100 and it standard deviation, depending on the test, is 15 or 16.