RESEARCH METHODS THINKING CRITICALLY WITH PSYCHOLOGICAL SCIENCE
THE SCIENTIFIC METHOD AND DESCRIPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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0 percent
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2.5 percent
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32 percent
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50 percent
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Detailed explanation-1: -For example, given that the IQ scores have a mean of 100 and a standard deviation of 15, one can conclude that only about 2.3% of the population have an IQ of 130 or higher. Here is how this works. First, let us define the “Standard Normal Distribution."
Detailed explanation-2: -Example: IQ Scores IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. About 68% of individuals have IQ scores in the interval 100 ± 1 ( 15 ) = [ 85, 115 ] .
Detailed explanation-3: –If IQ has a mean of 100 and a standard deviation of 15, what z score corresponds to a 130? (130-100)/15=2.
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.
Detailed explanation-5: -The number actually represents how your results compare to those of other people your age. A score of 116 or more is considered above average. A score of 130 or higher signals a high IQ. Membership in Mensa, the High IQ society, includes people who score in the top 2 percent, which is usually 132 or higher.