A histogram is a method that uses bars to display count or frequency data. The independent variable consists of interval- or ratio-level data and is usually displayed on the abscissa (x-axis), and the frequency data on the ordinate (y-axis), with the height of the bar proportional to the count. If the data for the independent variable are put into “bins” (e.g., ages 0-4, 5-9, 10-14, etc.), then the width of the bar is proportional to the width of the bin. Most often, the bins are of equal size, but this is not a requirement. A histogram differs from a bar chart in two ways. First, the independent variable in a bar chart consists of either nominal (i.e., named, unordered categories, such as religious affiliation) or ...

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