On a Standard IQ Test, the Standard Deviation Is 15

question 104

Multiple Choice

On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of .5) and we want 97 percent confidence in the results?

• A) 4,239
• B) 283
• C) 212
• D) 131
• E) 66

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Definitions:

Test Statistic

A quantity derived from sample data that is used in a hypothesis test to determine whether to reject the null hypothesis.

T Test

A statistical test used to compare the means of two groups and determine if the differences between them are statistically significant.

Research Hypothesis

A specific, testable prediction about what you expect to happen in your study, often regarding the relationship or effect of variables.

One-Tailed Test

A directional test, reflecting a directional hypothesis.