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When constructing a histogram, the spacing between the vertical bars depends on the type of variable being graphed. For a quantitative variable, the bars are typically drawn adjacent to one another with no gaps between them. However, when the variable is categorical, a small gap is conventionally left between the bars to distinguish the discrete categories.

Histogram Bar Gaps

According to standard graphing conventions, how should the spacing between vertical bars be handled depending on the type of variable being graphed?

In standard graphing conventions, leaving a small space between the vertical bars of a histogram indicates that the graphed variable is categorical rather than quantitative.

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