### Chapter 1. Descriptive Statistics: Frequency Distributions

### Frequency Distribution Graphs

Besides displaying a frequency distribution as a table, it also possible to represent a frequency distribution visually with the use of graphs such as *bar charts*, *histograms*, and *ogives*.

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Bar chart

A **bar chart **is used to display the frequencies of *qualitative *data.

The height of the bars corresponds to the observed frequency of each measurement category.

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Histogram

A **histogram **is used to display the frequencies of *quantitative* data.

Similar to bar charts, the height of the bars corresponds to the observed frequency of each measurement category.

A histogram displays the frequency of measurements falling into each of several adjacent bins (intervals), all of the same width. The width of the bins determines the amount of detail visible in the distribution of frequencies.

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Ogive

The graph of a cumulative frequency distribution is called an **ogive**.

The measurement categories are listed along the X-axis, and either the *cumulative frequency*, *cumulative relative frequency*, or *cumulative percent frequency* is listed along the Y-axis.

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