# graphing_techniques by nuhman10

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```									Graphing Techniques (from BSCS Biology, A Human Approach Appendix b):

Part A: Line Graphs

1. Review the data in the attached figure. Before you can make a graph using data
you have collected, you need to organize your data into a data table. For this
practice in graphing you will use this data.

Number of Mice Caught in a Field
Day Number of Mice Caught per
100 traps per night
0   25
30  45
60  38
90  30
120 20
150 14
180 13
210 8
240 7
270 11
300 4
330 13

2. Draw the x-axis and the y-axis for the graph. USE A RULER and graph paper so
that your lines are straight and perpendicular.
3. Identify what information will go on the x-axis and what information will go on
the y-axis. Information on the x-axis is usually constant in nature—for instance,
items such as dates, numbers, miles, and sizes. Information on the y-axis is
variable in nature—for instance, the number of mice caught, the number of people
of a certain height, or the numbers of butterflies captured.
4. Label each axis of the graph using the headings of the data table.
5. Set up the number scales on each axis. Allow space on each axis for all the
numbers that are included in the data table. (A number scale does not have to start
with the number 1, but the numbers do need to be spaced in equal increments.)
6. Give your graph a descriptive title.
7. Plot the data on your graph by doing the following:
a. Read one row of data from the data table, for example day 0 and 25 mice
caught.
b. Find the number on the x-axis where the piece of corresponding data fits
(for example 0).
c. Move up form the number on the x-axis to the place on the y-axis where
the corresponding piece of data fits (for example, 25).
d. Draw a dot, called a data point, at that place.
e. Repeat steps a-d for all the pieces of data in the data table.
8. Draw a smooth line from left to right that connects the data points. This should

Part B. Bar Graphs

1. Review the data in the following chart:
Population of Heath Hens, Martha’s Vineyard, MA
Year           Population Size
1900           90
1905           45
1910           280
1915           1010
1920           55
1925           40
1930           10

2. Draw the x- and y-axes for the graph.
3. Decide which information goes on each axis.
4. Label each axis, using headings in the data table
5. Decide on the number scales or labels for each axis. Position the numbers on the
x-axis so that you can draw bars in the spaces between the lines. Place the
numbers on the vertical axis next to the lines so that you can end a bar between
two numbers if necessary. (Intervals need to be constant)
7. Plot the data by following these steps:
a. Read 1 row of data from the data table, for example, year 1900 and
population size 90.
b. Find the label for the corresponding piece of data on the x-axis of the
graph, (for example, 1900).
c. Move up the column above the label to the appropriate number for that
piece of data on the y-axis (for example, 90).
d. Draw a horizontal line at that number to make the top of the bar.
e. Color in the bar from that line down to the x-axis.
f. Repeat steps a-e for all the pieces of data in the data table.

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