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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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