example 1 making a circle graph email a survey asked, “how often do you check your e- mail?” of...
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EXAMPLE 1 Making a Circle Graph
A survey asked, “How often do you check your e-mail?” Of the 100 people asked, 4 responded less than weekly, 23 responded weekly, and 73 responded every day. Display the data in a circle graph.
STEP 1 Use a proportion to find the number of degrees you should use to represent each response as a section of a circle graph.
Less than weekly Weekly Every day
4100
a360°= 23
100a
360°= 73100
a360°=
a = 14.4° 14° ≈ b = 82.8° 83°≈ c = 262.8° 263°≈
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EXAMPLE 1
STEP 2 Draw a circle. Show its center.
STEP 3 Use a protractor to draw the first angle measure. Labelthe section.
STEP 4 Draw and label remaining sections. Include a title.
The graph shows that most people check their e- mail every day.
Making a Circle Graph
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EXAMPLE 2
Environment
The table shows the number of insect species on the United States endangered species list. Make a line graph of the data.
STEP 1 Draw and label the horizontaland vertical scales.
STEP 2 Plot a point for each data pair.
Making a Box-and-Whisker Plot
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EXAMPLE 2 Making a Box-and-Whisker Plot
STEP 3 Draw line segments to connect the points. Include a title.
The graph shows an increase over time.
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GUIDED PRACTICE for Example 1 and 2
Use the table of polling data.
1. Make a circle graph of the data for Week 1. What does the graph show?
More people would vote for Ben in week 1;
ANSWERWho Will You Vote For?
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GUIDED PRACTICE for Example 1 and 2
2. Make a line graph of the data for Ben. What does the graph show?
The percent of people who would vote for Ben Decreased from week 1 to week 3;