The Cohen's D Effect Size Formula Is Simply a Z-Score

question 13

True/False

The Cohen's d effect size formula is simply a z-score formula, except that instead of comparing one case's score to the group mean in the numerator, it compares two group means in the numerator.

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Definitions:

Unimodal Distribution

A type of distribution that has a single peak or mode, showing one predominant frequency of data points.

Negatively Skewed Distribution

A distribution shape where the tail is on the left side, indicating that the bulk of values are concentrated on the right.

Mode

The number that occurs the greatest number of times in a series of data.

Median

The middle value in a data set when the values are arranged in order, or average of the two middle values when there is an even number of observations.