Interpreting Charts and Graphs
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Interpreting Charts and Graphs
In order to read and interpret graphs, it is important to understand what the parts of a graph tell us. Let’s start by looking at bar graphs.
Bar Graphs
Used to compare data between different groups
Allows you to make quick generalizations
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5
10
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# o
f S
tud
ents
A B C D F
Letter Grade
Unit 1 Test Results
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# o
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tud
ents
A B C D F
Letter Grade
Unit 1 Test Results
Parts of a Bar Graph
uses keywords to tell what the graph is aboutTitle
Labels
Scaleshows the units used on the y axis
explains what kind of data is shown on the x and y axis
represent the data amount for each group
Bars
Now let’s take a look at what line graphs can tell us.
Line Graphs
Track change over time
Allows you to see small changes
Can see change for more than one group over the same time period. (multiple line graphs)
Raffle Tickets Sold by the 7th Grade Class
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0 2 4 6 8
Week
# of Tic
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s
Raffle Tickets Sold by the 7th Grade Class
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50
100
150
200
250
300
0 2 4 6 8
Week
# of Tic
ket
s
Parts of a Line Graphuses keywords to tell what the graph is aboutTitle
Labels
Scaleshows the units used on the y axis
explains what kind of data is shown on the x and y axis
Pointsrepresents the data amount
Lineconnects the data points
Now let’s take a look at what circle graphs can tell us.
Circle Graphs or Pie Charts
Allows you to compare parts of a whole
Pet Survey for 8th Grade
10%
45%15%
25%
5%
Cats Dogs Cats and Dogs No Pets Fish
Pet Survey for 8th Grade
10%
45%15%
25%
5%
Cats Dogs Cats and Dogs No Pets Fish
Parts of a Circle Graph
uses keywords to tell what the graph is aboutTitle
Legend
explains what each sector or slice represents
Sectorsrepresents one part of the dataset
Let’s practice interpreting different types of graphs. The questions without multiple choice answers are questions to think about. Those questions with multiple choice answers need to be answered as directed by your teacher.
Building Name CityHeight
(ft)Height
(m)Sears Tower Chicago 1451 442
Aon Center Chicago 1136 346
Empire State Building New York 1250 381
John Hancock Center Chicago 1127 344
Trump International Hotel and Tower Chicago 1362 415
Bank of America Tower New York 1200 366
Chrysler Building New York 1046 319This includes spires and architectural details but does not include antenna masts.
Becker, Lynn. "The World's Tallest Buildings - America's latest Outsourcing".
Think about the table. What does this table represent? How do you know? What clues are there that tell youabout the information in this chart?
Tallest Buildings in the United States
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500
750
1000
1250
1500
Sears Tow er Aon Center Empire StateBuilding
John HancockCenter
Trump InternationalHotel and Tow er
Bank of AmericaTow er
Chrysler Building
Building Name
Hei
gh
t (i
n f
t)
Answer the following on a notebook piece of paper and turn in.
1. What does the graph show?a. time it took to build these buildings
b. tallest buildings in the world d. tallest buildings in the United States
c. cost of the tallest buildings in the United States
Look at the bar graph that was created from the previous table.
Tallest Buildings in the United States
0
250
500
750
1000
1250
1500
Sears Tow er Aon Center Empire StateBuilding
John HancockCenter
Trump InternationalHotel and Tow er
Bank of AmericaTow er
Chrysler Building
Building Name
Hei
gh
t (i
n f
t)
2. Which is the tallest building in the United States?
a. Sears Tower
b. Aon Center d. Empire State Building
c. Trump International Hotel and Tower
Look at the bar graph that was created from the previous table.
Tallest Buildings in the United States
0
250
500
750
1000
1250
1500
Sears Tow er Aon Center Empire StateBuilding
John HancockCenter
Trump InternationalHotel and Tow er
Bank of AmericaTow er
Chrysler Building
Building Name
Hei
gh
t (i
n f
t)
3. Which two buildings appear to be approximately the same height?a. Sears Tower and Trump International Hotel and Tower
b. Bank of America Tower and Sears Tower
d. Empire State Building and Chrysler Building
c. John Hancock Center and Aon Center
Look at the bar graph that was created from the previous table.
Tallest Buildings in the United States
0
250
500
750
1000
1250
1500
Sears Tow er Aon Center Empire StateBuilding
John HancockCenter
Trump InternationalHotel and Tow er
Bank of AmericaTow er
Chrysler Building
Building Name
Hei
gh
t (i
n f
t)
4. The Chrysler Building is the shortest bar. Does this mean it is the shortest building in the United States?
a.Yes b.No
Look at the bar graph that was created from the previous table.
Harris County Population Growth
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
1890 1910 1930 1950 1970 1990 2010
Year
Nu
mb
er
of
Peo
ple
5. What does the graph show?
a. population growth in Harris County
b. salary growth in Harris County d. number of people in each county
c. number of years Harris County has existed
Look at the line graph. Read each of the parts of the graph.
Harris County Population Growth
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
1890 1910 1930 1950 1970 1990 2010
Year
Nu
mb
er
of
Peo
ple
6. What does the y axis represent on this line graph?
a. which year the population grew
b. number of people d. none of these
c. number of years
Look at the line graph. Read each of the parts of the graph.
Harris County Population Growth
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
1890 1910 1930 1950 1970 1990 2010
Year
Nu
mb
er
of
Peo
ple
7. What can not be determined by looking at this graph?
a. between which decade the population increased
b. the approximate number of people in Harris County in 2000
d. that the population more than doubled between 1940 and 1960
c. the population of Houston in 1880
Look at the line graph. Read each of the parts of the graph.
8. Which table below best represents the circle graph?
Look at the circle graph. Read each part of the graph.
Summer Activities
Hanging Out with Friends Going on Vacation Going swimming
Activity Number of Students
Hanging out with friends
10
Going on Vacation
20
Going swimming
10
Activity Number of Students
Hanging out with friends
30
Going on Vacation
25
Going swimming
5
Activity Number of Students
Hanging out with friends
35
Going on Vacation
5
Going swimming
20
Activity Number of Students
Hanging out with friends
25
Going on Vacation
25
Going swimming
10
A. B. C. D.
9. What can not be determined by looking at this graph?
a. the number of people surveyed
b. the percentage of 8th graders who have dogs
d. ¼ of the 8th graders surveyed have no pets
c. twice as many people have cats rather than fish
Look at the circle graph. Read each part of the graph.
Pet Survey for 8th Grade
10%
45%15%
25%
5%
Cats Dogs Cats and Dogs No Pets Fish
10. Which type of graph would you choose to show ticket sales over a period of time?
a. bar graph
b. line graph d. none of these
c. circle graph
11. Which type of graph would best display what percent of the athletic shoe industry is dominated by Nike?
a. bar graph
b. line graph
d. none of these
c. circle graph
Sneakers Sold This Month
Brand Name
Number Sold
Adidas 25
Nike 32
Reebok 10
Asics 18
Other 15
Total 100
12. Which type of graph would best display the number sold for each company?
a. bar graph
b. line graph
d. none of these
c. circle graph
Sneakers Sold This Month
Brand Name
Number Sold
Adidas 25
Nike 32
Reebok 10
Asics 18
Other 15
Total 100
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