Having the intervals, one can construct the frequency table and then draw the frequency histogram or get the relative frequency histogram to construct the relative frequency histogram. For example, Minitab includes the left end point and excludes the right end point. An alternative is to specify the endpoint convention. 5 is to avoid confusion whether the end point belongs to the interval to its left or the interval to its right. The reason that we choose the end points as. Since the data range is from 132 to 148, it is convenient to have a class of width 2 since that will give us 9 intervals. The table below shows her recorded weights in pounds.įor histograms, we usually want to have from 5 to 20 intervals. Jessica weighs herself every Saturday for the past 30 weeks.
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