Histogram

A graph displaying continuous data in intervals, with touching bars. For equal-width intervals, bar height can represent frequency.

A display of a frequency distribution using touching bars for continuous numerical intervals. Each bar’s area represents frequency.

A histogram shows the distribution of continuous measurements grouped into intervals. A scatter diagram shows whether two measured variables are related.

A graph showing continuous numerical data grouped into intervals, with touching bars whose areas represent frequencies.

Keep gaps between bars for separate categories or discrete values; histogram bars touch.

Keep bar-chart bars equal in width with equal gaps. Histogram bars touch; use equal-width intervals when plotting frequency as bar height.

Keep bar-chart bars equal in width with equal gaps. For a histogram with equal-width intervals, draw touching bars with frequency on the vertical axis.

The tallest histogram bar identifies the interval containing the most measurements: 0.3 to below 0.4 seconds. Adding the first two frequencies shows that 15 participants had reaction times below 0.4 seconds. Unlike a bar chart, the intervals must remain in numerical order.

A graph displaying continuous data grouped into intervals, with touching bars. For equal-width intervals, bar heights show frequencies.

Definition

How each exam board covers it

AQA GCSE Psychology · 8182

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OCR GCSE Psychology · J203