what does histograph mean?
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“A histogram. . . is used to summarize discrete or continuous data that are measured on an interval scale. It is often used to illustrate the major features of the distribution of the data in a convenient form. A histogram divides up the RANGE of possible values in a data set into classes or groups.”
“A histograph, or frequency polygon, is a graph formed by joining the midpoints of histogram column tops”
For more details, and illustrations of each see:
http://www.statcan.ca/english/edu/power/ch9/histograms/histo.htm
As far as whether the bars TOUCH each other or not — this is frequently the case, IF the data ranges are CONTINUOUS. If they are discrete, the bars are separated.
hope that helps =)
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