Rachel has just completed a study of precipitation in three different locations over the course of a year. The data she wishes to present in graph form is shown in the table below, with precipitation listed in inches. BostonPhoenixMinneapolisJanuary3.270.451.04February3.440.48.76March3.100.711.12April3.890.312.10May3.750.173.15June3.120.095.11July2.980.115.78August3.070.334.65September3.150.523.61October3.550.403.22November3.420.422.34December3.440.291.84Rachel wants her graph to emphasize the relation of each city’s precipitation to each other city’s at each point in time. What kind of graph would be appropriate?
A line graph is appropriate because the data track precipitation month by month over a year. Plotting one line for each city makes it easy to compare the cities’ precipitation at the same point in time and see how each city’s amounts change over the year. A bar graph can compare individual values, but a line graph shows the time-based relationship more clearly.
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