Chapter 2.3
Time series graphs and Pie Graphs
Time Series Graph
• A time series graph represents data that occur
over a specific period of time.
• Very similar to line graph
Steps for making a Time-Series Graph
1. Draw and label the x and y axes
2. Label the x axis for time and the y axis for
numbers
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
Create a Time Series graph
• The number of homicides that occurred in the
workplace for the years 2003-2008 are shown.
Draw and analyze a time series graph for the
data.
Year
2003
Number 632
2004
2005
2006
2007
2008
559
567
540
628
517
Time-Series graph of Workplace
Homicides
Compound time series graph
• Two or more data sets can be compared on the
same graph called a compound time series
graph
Create a compound time series graph
• Construct a compound times series graph for the
data in the table
• The data represents the number of successful
space launches by the United States and Japan
for the years 1993-1997
Year
1993
1994
1995
1996
1997
United
States
29
27
24
32
37
Japan
1
4
2
1
2
Time series graph of space launches
Pie Graph
• A pie graph is a circle that is divided into
sections or wedges according to the percentage
of frequencies in each category of the
distribution.
• The purpose of the pie graph is to show the
relationship of the parts to the whole by visually
comparing the sizes of the sections.
Steps for creating a pie graph
1. Since there are 360° in a circle, the frequency
for each class must be converted into a
proportional part of the circle.
2. Convert each frequency to a percentage (not
the same as the degrees)
3. Draw your circle graph as accurately as
possible (protractors when possible)
Super Bowl Snacks
The frequency distribution shows the number of pounds
of each snack food eaten during the super Bowl..
Snack
Pounds
Potato Chips
11.2 million
Tortilla Chips
8.2 million
Pretzels
4.3 million
Popcorn
3.8 million
Snack nuts
2.5 million
Percentage
Pie Graph – Super Bowl Snacks
Create a Pie Graph for the Data
The table show the blood types of 25 army inductees
Class
Frequency
A
5
B
7
O
9
AB
4
Percent
Pie Graph – Blood Types
With a little help from our friends…
• Making bar graphs, time series graphs and pie
graphs using Excel!
• Pg. 91-94