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A research organization that specializes in studies about advertising effectiveness is an example of a(n) :
Test-retest Reliability
Describes the degree to which the results of the same test administered on two separate occasions to the same individuals remain consistent.
Percentile
A statistical measure indicating the value below which a given percentage of observations in a group of observations falls.
Normal Curve
A bell-shaped curve that represents the distribution of many types of data in which most values cluster around a central mean.
Standard Deviation
A statistic that measures the dispersion or variation from the average in a set of data, indicating how spread out the numbers are.
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