Chapter 2.3Time 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 axes2. Label the x axis for time and the y axis

for numbers3. Plot each point according to the table4. 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 2004 2005 2006 2007 2008

Number

632 559 567 540 628 517

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

Snack Pounds Percentage

Potato Chips 11.2 million  

Tortilla Chips 8.2 million  

Pretzels 4.3 million  

Popcorn 3.8 million  

Snack nuts 2.5 million  

The frequency distribution shows the number of pounds of each snack food eaten during the super Bowl..

Pie Graph – Super Bowl Snacks

Create a Pie Graph for the Data

Class Frequency Percent

A 5  

B 7  

O 9  

AB 4  

The table show the blood types of 25 army inductees

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