Explain the differences between bar graphs and histograms.
What will be an ideal response?
Ans: Histograms are very similar to bar graphs but there are two differences. First, qualitative variables have no natural ordering, so how the categories are arranged on the x-axis of a bar graph is arbitrary. It would change nothing if the categories are shown in random-, or alphabetical-order. The second difference between histograms and bar graphs is that there is no space between the bars of a histogram as there is between the bars of a bar graph. We adopt this convention to convey the fact that the levels of the variable have a natural order. When the bars touch it conveys the continuity of adjacent values of the variable.
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