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```					 7-5 Misleading Graphs

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Warm Up
California Standards
Lesson Presentation

Holt CA Course 1

Warm Up
Use the graph for questions 1-3.

most viewers? ABC
fewest viewers? FOX
viewership?
CBS, NBC

Holt CA Course 1

California
Standards
SDAP2.3 Analyze data displays
and explain why the way in which the
influenced the results obtained and why
the way in which the results were
displayed might have influenced the
conclusions reached.
Also covered:           SDAP2.5

Holt CA Course 1
Sometimes data is presented in a way that influences how
the data is interpreted. A data display that distorts

An axis in a graph can be “broken” to
make the graph easier to read.
However, a broken axis can also be

In the graph at right, the cost per
minute for service with Company B
looks like it is twice as much as the
cost for service with Company A.
In fact, the difference is only \$0.10
per minute.

Holt CA Course 1

Which graph could be misleading? Why?

The graph at left could be misleading. It gives the
impression of greater temperature change because
the vertical axis does not begin at zero.

Holt CA Course 1

Explain how you could redraw the graph so it

Draw the entire vertical
scale on the graph.

Holt CA Course 1

Explain how you could redraw the graph so it

Make the icons for cars, light trucks, and heavy
trucks the same size.

Holt CA Course 1
Check It Out! Example 1
Which graph could be misleading? Why?
Average Restaurant Meal Price
Graph A
Graph B
20                                                        25
Price per meal

Price per meal
15                                                        20

10                                                        15

5                                                   10

0   Gino’s Village Pasta   City                     5    Gino’s Village Pasta   City
Grill   City   Diner                                 Grill   City   Diner

Graph B could be misleading. The vertical axis does not
begin at zero, so differences in scales appear greater.

Holt CA Course 1
Check It Out! Example 2B

Explain how you could redraw the graph so it
Water Consumed
Draw the entire
48
vertical scale on the

Ounces of Water
graph. The vertical                        40
axis does not start at                     32
zero so differences in
24
water consumed
seem greater.                              16
Mark   Frank   Mila   Yvonne

Holt CA Course 1
Lesson Quiz
Explain why each graph could be misleading and why.

1.                                2.

The scale does not start
The vertical scale does not     at 0, so it looks like
start at 0, so it looks like    fewer people like each
sales revenues were small.      type of animal.

Holt CA Course 1

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