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Bar chart
A chart that displays frequencies for qualitative categories using separated, equal-width bars where bar height represents frequency.
Class interval
A range of values (such as $20.0 < x \le 20.5$) used to group quantitative data in a frequency table.
Frequency density
Frequency divided by class width, used on the vertical axis of a histogram when class widths are unequal.
Grouped frequency table
A frequency table where values are combined into class intervals, and each interval has a frequency.
Histogram
A graph for quantitative data where values are grouped into class intervals on the horizontal axis, the bars touch, and the bar area represents frequency (or relative frequency).