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Unformatted text preview: en a caption or title that describes its contents, giving enough information to allow the figure to be self-contained. Capitalize only the first word in a figure title and place a period at the end. The Line Graph Line graphs show changes in the quantity of the chosen variable and emphasize the rise and fall of the values over their range. Use a line graph to present continuous data. For example, changes in the dependent variable, soybean weight, measured over time would be depicted best in a line graph. • Plot data as separate points. • Whether to connect the dots or draw a best fit curve depends on the type of data and how they were collected. To show trends, draw smooth curves or straight lines to fit the values plotted for anyone data set. Connect the points dot to dot when emphasizing meaningful changes in values on the x axis. Figure 1.4 Differences in traffic fatalities in 2000 for male and female drivers by age. • If more than one set of data is presented on a graph, use different colors or symbols and provide a key or legend to indicate which set is which. • A boxed graph, instead of one with only two sides, makes it easier to see the values on the right side of the graph. Note the features of a line graph in Figure 1.4, which shows that young males are the most likely victims of car crashes based on data from 2000. Bar graphs are constructed following the same principles as for line graphs, except that vertical bars, in a series, are drawn down to the horizontal axis. Bar graphs are often used for data that represent separate or discontinuous groups or nonnumerical categories, thus emphasizing the discrete differences between the groups. For example, a bar graph might be used to depict differences in number of seeds per pod for treated and untreated soybeans. Bar graphs are also used when the values on the x axis are numerical but grouped together. These graphs are called histograms. Note the features of a bar graph in Figure 1.5, which depicts the prevalence of obesity in US women and men from 1960 to 2000. Biology 6C Figur...
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This note was uploaded on 09/02/2011 for the course BIOL 6C taught by Professor Sundram during the Spring '09 term at DeAnza College.

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