2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
2.3 – Bar Graphs, Pareto Charts, Time Series Graphs, & Pie Charts
Bar Graph: Represents qualitative/categorical data using vertical or
horizontal bars. Heights = Frequencies.
*Used for qualitative or categorical data.
STEPS:
1. Draw and label the x and y axes. The x­axis is the frequency, where
the y­axis represents the categories.
2. Draw the bars corresponding to the frequencies. The bars should not
touch.
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2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
Pareto Charts: Bar graph where bars are arranged from highest to lowest
*Used for qualitative or categorical data.
STEPS:
1. Arrange the data from the largest to the smallest according to
frequency.
2. Draw and label the x and y axes.
3. Draw the bars corresponding to the frequencies.
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2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
Time Series Graph: Represent data that occur over a specific period of time.
STEPS:
1. Draw and label the x and y axes
2. Label the x­axis for the time and the y­axis for the frequency
3. Plot each point according to the table
4. Draw line segments connecting adjacent points. Do not try to fit a
smooth curve through the data points.
*A Compound Time Series Graph compares two or more data sets on
the same graph.
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2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
The Pie Chart: A circle that is divided into sections or wedges according to %
of frequency in each category of the distribution.
STEPS:
1. Since there are 360° in a circle, the frequency of each class must be
converted to represent a proportional part of the circle. To convert:
Degrees =
2. Each frequency must also be converted to a percentage(%).
%=
3. Using a protract and compass, draw the graph using the
appropriate degree measures found in Step 1. Label each section with
the name and percentages.
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2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
In Class example page 84, Example #4: Construct a pie chart:
80
90
100
90
80
70
140
130
70
60
120
140
50
130
40
30
100
110
50
110
120
60
4°
40
150
30
160
150
20
20
160
10
10
170
0
180
0
170
180
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2.3 Day 1 ­ Other Types of Graphs.notebook
February 24, 2015
Homework:
pg. 84 #1, 3, 6 (time series), 10
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