A Researcher Determines That the Crime Rate in a Large

question 651

Multiple Choice

A researcher determines that the crime rate in a large city is related to the phases of the moon. She concludes that the gravitational pull of the moon influences human behavior. She does not understand

• A)the dangers of a single example.
• B)the difference between observation and inference.
• C)the difference between correlation and causation.
• D)that the Barnum effect occurs only in ten-year cycles.

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Definitions:

Cohen's D

A measure of the size of an effect for a hypothesis test; it is the difference between two means divided by the standard deviation of the data.

Cohen's D

A statistic used to quantify the difference between two group means relative to the standard deviation of the sample.

Cohen's D

A measure of effect size that quantifies the difference between two group means in standard deviation units.

Cohen's D

A measure of effect size indicating the standardized difference between two means, often used in psychological and educational research.