Lesson 2­3.notebook
October 26, 2010
Chapter 2: Lesson 3
Time Series Plots and Pie Graphs
Time Series Graphs ­
Represent data that occur over a specific period of time with a connected line. Much like a histogram. The time variable is always placed on the horizontal axis.
2 or more data sets on the same graph are referred to as a compound time series plot
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Lesson 2­3.notebook
October 26, 2010
Example 1
Time Series Plots
Make a time series plot for the amount of Precipitation in Cold Spring for the year 2006
January ­ 1.2”
February ­ 2.4”
March ­
.8”
April ­
1.8”
May ­
6.9”
June ­
.4”
July ­
.2”
August ­
.2”
September
3.6”
October
3.4 “
November
1.8”
December
5.5”
Analyze your results. What conclusions can we make?
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Lesson 2­3.notebook
October 26, 2010
Unusual Stat
The average life expectancy of a $1 bill: 22 months
of a $10 bill: 3 years
of a $20 bill: 4 years
of a $50 bill: 9 years
of a $100 bill: 9 years
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Lesson 2­3.notebook
October 26, 2010
Pie Graph ­
A circle that is divided into sections or wedges according to the percentage of frequencies in each category of a distribution.
Steps for making a Pie­graph
Step 1: Find the total (n) number of
values in the set of data
Step 2: Since there are 360 degrees in a
circle, find proportional part
of the circle for each subgroup
of data by using the following
formula: Degrees = f . 360
n
Step 3: find the percentage of each subgroup
Step 4: Using a protractor, draw the
graph using the appropriate
degree measures.
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Lesson 2­3.notebook
October 26, 2010
Example 2
Pie Graph
Conduct a class survey of the colors of eyes students have in this class. Graph the results using a pie­graph.
Class
Frequency
Percent
Blue
Green
Hazel
Brown
Analyze the Results.
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Lesson 2­3.notebook
October 26, 2010
Example 3: Applying the concepts:
The following graph shows approximations of the leading causes of death among men ages 25­44 years. The rates are per 100,000 men. Answer the following questions about the graph.
1.) What are the variables in the graph?
2.) Are the variables qualitative or quantitative?
3.) Are the variables discrete or continuous?
4.) What type of graph was used to display the graph?
5.) Could a pie­graph be used to display the data?
6.) List some typical reasons for creating a time series chart.
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Lesson 2­3.notebook
October 26, 2010
Assignment
Page 85
#6, 7, 8, 10, 12, 13, 20
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