Histograms, Frequency Polygons, and Ogives

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histogram

a graph that displays data by using contiguous vertical bars of various heights to represent the frequencies of the classes

frequency polygon

a graph that displays the data by using lines that connect points plotted for the frequencies at the midpoints of the classes. The frequencies are represented by the heights of the points.

ogive

a graph that represents the cumulative frequencies for the classes in a frequency distribution

cumulative frequency

the sum of the frequencies accumulated up to the upper boundary of a class in the distribution

relative frequency graphs

used when the proportion of data values that fall into a given class is more important than the actual number of values that fall into that class


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