An Investigation of the Relationship Between Years of Formal Education

question 50

Multiple Choice

An investigation of the relationship between years of formal education and IQ that was conducted with a sample size of 100 found a statistically significant correlation of .25.Another investigation of the same relationship had the same r value based on a sample size of 10,but it was not statistically significant.Why might this be?

• A)a sample size of 100 has too much sampling error
• B)a sample size of 10 is more likely to produce a Type I error
• C)as sample size increases so does the power of the statistic
• D)the standard error was larger in the sample where N = 100

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Definitions:

Randomness

A principle in which individual outcomes or events are unpredictable, but the statistical distribution of outcomes over many repetitions will show a specific pattern.

Scale Items

Individual questions or statements in a survey or questionnaire that are scored to measure a particular construct or variable.

Readability

The ease with which text can be read and understood by its intended audience.

Exploratory Factor Analysis (EFA)

A statistical technique used to identify underlying variables, or factors, that explain the pattern of correlations among measured variables.