BIOLOGICAL BASES OF BEHAVIOR
PREDICTING INDIVIDUAL DIFFERENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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an increasing slope.
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a normal bell curve.
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an equilateral figure.
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a negative correlation.
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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. Values in this particular interval are the most frequent. Approximately 95% of the population has IQ scores between 70 and 130. Approximately 99.7% of the population has IQ scores between 55 and 145.
Detailed explanation-2: -The term “bell curve” is used to describe a graphical depiction of a normal probability distribution, whose underlying standard deviations from the mean create the curved bell shape. A standard deviation is a measurement used to quantify the variability of data dispersion, in a set of given values around the mean.
Detailed explanation-3: -Bell Curve: When IQ scores are plotted on a graph, they typically follow a bell-shaped curve.1 The peak of the “bell” occurs where the majority of the scores lie. The bell then slopes down to each side; one side represents lower than average scores and the other side represents scores that are above the average.
Detailed explanation-4: -e.g. IQ is normally distributed (mean = 100, SD = 15). 68% of people have IQs between 85 and 115 (100 +/-15). 95% have IQs between 70 and 130 (100 +/-(2*15). 99.7% have IQs between 55 and 145 (100 +/-(3*15).