Now draw a rectangle over each value, with a height corresponding to the frequency of that value: Remember that the number of dots over each value on the horizontal axis corresponds to the frequency of that data value: We start with the line plot we’ve been using. Let’s look at the transition from line plot to frequency bar graph. That’s a lot of dots for data sets with hundreds or thousands of values! You can, however, replace a line plot with a frequency bar graph. But for larger data sets, it can be awkward to create, since for each data value there is a corresponding dot. It’s especially helpful as a device for learning basic statistical ideas. The line plot is a useful graph for examining small sets of data.
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