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6-8 Misleading Graphs
6-8 Misleading Graphs
Warm Up
Problem of the Day
Lesson Presentation
Course
Course 1 1
6-8 Misleading Graphs
Warm Up
Use the data below to answer each
question.
20 21 23 24 27 33 34 35 36
38 40 41 42 43 46 52 53
1. What is the median? 36
2. What is the mode? none
3. What is the range? 33
Course 1
6-8 Misleading Graphs
Problem of the Day
Nine students in a group found that
their mean score was 86 for the first
math test. On the next test, each
student in the group scored 7 points
higher than on the first test. What was
their mean score for the two tests?
89.5
Course 1
6-8 Misleading Graphs
Learn to recognize misleading graphs.
Course 1
6-8 Misleading Graphs
Additional Example 1A: Misleading Bar Graphs
Why is this bar graph misleading?
Because the lower part of the vertical axis is
missing, the differences in prices are
exaggerated.
Course 1
6-8 Misleading Graphs
Additional Example 1B: Misleading Bar Graphs
What might people believe from the
misleading graph?
1
__ 1
__
People might believe that Cars B and C cost 1 to 2
2 2
times as much as Car A. In reality, Cars B and C are
only a few thousand dollars more than Car A.
Course 1
6-8 Misleading Graphs
Check It Out: Example 1A
Money Raised
600
580
570
Dollars
560
550
540
530
4th graders 5th graders 6th graders
Why is this bar graph misleading?
The vertical axis begins at 530 rather than 0.
Course 1
6-8 Misleading Graphs
Check It Out: Example 1B
Money Raised
600
580
570
Dollars
560
550
540
530
4th graders 5th graders 6th graders
What might people believe from the
misleading graph?
That the 5th graders have raised twice as
much money as the 4th graders.
Course 1
6-8 Misleading Graphs
Additional Example 2A: Misleading Line Graphs
Why are these graphs misleading?
If you look at the scale for each graph, you will
notice that the April graph goes from 54° to 66°
and the May graph goes from 68° to 80°.
Course 1
6-8 Misleading Graphs
Additional Example 2B: Misleading Line Graphs
What might people believe from these
misleading graphs?
People might believe that the temperatures in May were
about the same as the temperatures in April. In reality, the
temperatures in April were about 15 degrees lower.
Course 1
6-8 Misleading Graphs
Additional Example 2C: Misleading Line Graphs
Why is this line graph misleading?
The scale goes from $0 to $80, and then
increases by $5.
Course 1
6-8 Misleading Graphs
Check It Out: Example 2A
September November
Temperature (°F)
Temperature (°F)
90 70
80
70 60
60 50
50 40
40
30
30
20 20
10 10
0 0
1 2 3 4 1 2 3 4
Week Week
Why are these graphs misleading?
If you look at the scale for each graph, you will
notice that the September Graph goes from
85° to 70° and the November graph goes from
65° to 50°.
Course 1
6-8 Misleading Graphs
Check It Out: Example 2B
September November
Temperature (°F)
Temperature (°F)
90 70
80
70 60
60 50
50 40
40
30
30
20 20
10 10
0 0
1 2 3 4 1 2 3 4
Week Week
What might people believe from these
misleading graphs?
People might believe that the temperatures in
September were about the same as the temperatures in
November. In reality, the temperatures in September
were about 20 degrees higher.
Course 1
6-8 Misleading Graphs
Check It Out: Example 2C
Stock prices Corp. C
Price of stock ($) 80
Corp. D
70
60
50
0
1985 1990 1995 2000
Year
Why is this line graph misleading?
The scale goes from $0 to $50, and then
increases by $10.
Course 1
6-8 Misleading Graphs
Lesson Quiz
1. Why might this line graph be misleading?
The scale does not start at zero.
2. What might people believe from the graph?
Possible answer: that there were hardly any
visitors on Monday
Course 1
