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The answer depends on what kind of comparisons you want to make.
If the comparison is over time periods (for example a shop's daily sales) then a line graph with time along the horizontal axis is best. If you want to compare the number of males and females in various age groups in a country's population (its gender demography), then back-to-back horizontal bar charts are best. If you want to compare how two countries spend money on major activities - for example defence, health, education, social security, transport - then a pair of pie charts might be appropriate. If you wish to compare how well people in two classes scored in a test then a pair of box and whiskers plots would be easiest.


There is no single form that is best in all circumstances and a good statistician is one who can select the most appropriate type of graph to illustrate the comparison that is being made.


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