The Stanford Binet Intelligence Quotient is a normed intelligence test, and its IQ measures are quite normally distributed. Its standard deviation is 16. If the test were perfectly normal in its distribution, this would mean which of the following?
(Select all that apply.)
a. There are more people with IQs of 100 than any other number.
b. For every person with an IQ of 120, there is one with an IQ of 80.
c. More than 95 of people have IQs between 68 and 132.
d. If someone's IQ is measured as 109, and years later it is measured as 112, someone else's IQ has dropped three points.
e. About 14 of people have IQs between 117 and 132.
f. Excluding people with IQs of exactly 100, half of the remainder have IQs lower than 100, and the other half have IQs higher than 100.
Question 2
The data set is: 2, 3, 6, 7, 12. A measure of dispersion is calculated, and it is about 3.5. What is this measure of dispersion?
a. The difference score
b. The variance
c. The range
d. The standard deviation
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