What term best describes a data distribution, such as a set of depression inventory scores, that demonstrates an overall pattern with two distinct peaks?

A hypothetical distribution of scores on the Beck Depression Inventory provides an example of a bimodal distribution, demonstrating a pattern with two distinct peaks that might represent divergent subpopulations within a dataset.

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A bimodal distribution is a specific shape of data distribution characterized by two distinct peaks, representing two scores or categories that occur most frequently. While less common than unimodal distributions in psychological research, they can emerge when different subsets of a sample respond divergently.

Bimodal Distribution

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KPU Research Methods in Psychology - 4th American Edition

Example of a Bimodal Distribution

In a bimodal distribution, the measures of central tendency do not align at a single point. The mean and the median will typically fall somewhere in the middle between the two peaks, whereas the mode will be located exclusively at the tallest peak of the distribution.

Central Tendency in a Bimodal Distribution

A hypothetical histogram representing scores on the Beck Depression Inventory illustrates a bimodal distribution by displaying two distinct peaks within the data spread.

Bimodal Distribution of Scores on the Beck Depression Inventory

A researcher measures the anxiety scores of students before an exam. Upon graphing the data, they notice the distribution has two distinct peaks, indicating that one subset of students scored very low while another subset scored very high. Which term best describes the specific shape of this data distribution?

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