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Chapter 1, Section 3:
Communicating with
Graphs
(C.P. Exploring Science)
GRAPHS
A visual display of information or data
Why use graphs?
They show patterns in data better than a
table
GRAPHS
Graphs make understanding the data easier
With graphs, you can see patterns and trends
and make conclusions
Race/Ethnicity
AP Examinee Population
Asian, Asian American or Pacific Islander
10.2%
8.2%
15.5%
Black or African American
Hispanic or Latino
American Indian or Alaska Native
White
Not reported/other
Which
display is
easier to
understand?
0.6%
59.4%
6.1%
GRAPHS
What are the three common types of
graphs?
LINE, BAR, CIRCLE
LINE GRAPHS
Show the relationship of how the dependent variable changes
due to changes in the independent variable
LINE GRAPHS
You can show more
than one event on
the same graph as
long as the
relationship is the
same
NEEDS A KEY!
CONSTRUCTING LINE GRAPHS
x-axis is the Independent Variable
y-axis is the Dependent Variable
CONSTRUCTING LINE GRAPHS
Because the points are RELATED, connect them
This is how you can tell if a line graph is most
appropriate. If you are not looking to see CHANGE then
you don’t need a line graph.
Should this be a line graph?
NO! There is no relationship
in the change. It should be a
bar graph.
CONSTRUCTING LINE GRAPHS
MEASUREMENT –
all should be in
the SAME unit
and be sure your
divisions make
sense.
Use a “break” if
you need it.
BAR GRAPHS
Used to compare TOTALS that don’t need to show
change over time
Show comparisons of quantities counted at a
particular time.
BAR GRAPHS
Multiple bar graphs show two or more sets of
data:
Like a multiple line graph,
you will need a key.
CIRCLE (PIE) GRAPHS
Show how some fixed quantity is broken down into parts
The whole circle represents the total
The slices represent the PERCENTAGES of the total
CIRCLE (PIE) GRAPHS
To create a circle graph, start
with the total and divide each
part by the total and multiply
by 360⁰ to find the angle the
slice will occupy
FOR EXAMPLE: if the total
number of grades counted
were 100 and the number
of A’s were 31, to get the
size angle A’s occupy would
be:
31 ÷ 100 × 360⁰ = 112⁰
(size of the slice for A’s)
WHAT’S WRONG WITH THESE
GRAPHS???
WHAT’S WRONG WITH THESE
GRAPHS???
WHAT’S WRONG WITH THESE
GRAPHS???
WHAT’S WRONG WITH THESE
GRAPHS???