Histograms and graph summary

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Presentation transcript:

Histograms and graph summary

Histograms A histogram is similar to a bar graph, but not at all the same. The main differences are that the data categories have to be quantitative, the bars have to follow the order of the categories, and the widths of the bars must have specific meaning. At the K-12 level, it is assumed that all the bars have the same width.

Histogram: numerical

Book page 578 Bar graph—Used to compare numbers of data items in grouped categories. Circle graph—Used to show the division of a whole into parts. Histogram—Used to compare numbers of data items typically grouped in numerical intervals; order matters in the data depicted. Stem and leaf plot—Used to show each value in a data set and to group values into intervals. Scatterplot—Used to show the relationship between two variables. Line graph—Used to show how data values change over time; normally used for continuous data.