Side-by-Side Boxplots of the Lean Percentages
of Control and Treated Hogs
56
Boxplots
50
Lean Percetage
• Example: need 11 or 15 volunteers who
know how much sleep they got last night
52
54
• See handout on five-number summary
48
• Boxplots are useful for comparing multiple
distributions
1
Treatment
2
Control
Histogram of Exam Scores
Histogram of Amount Spent on Most Recent Haircut
8
4
3
140
120
100
80
Median
-----82
60
5
S.D.
---21.1
40
6
Mean
---75.9
Number of Students
Top Ten
--------100
100
99
99
98
97
97
97
95
92
7
20
2
0
1
0
0
20
30
40
50
60
Exam Score
70
80
90
100
20
40
60
80
100
Amount Spent in Dollars
3
4
1
Match the Datasets to the Histograms
Histogram of Time Spent Sleeping the Night
before Classes Began
100
50
0
Number of Students
150
1. Number of menstrual cycles required to achieve
pregnancy for a sample of women who attempted
to get pregnant. These data were self-reported
from memory. (“Conception--waits in fertile
women after stopping oral contraceptive,” Int. J.
Fertility, 29 73-80)
2. Numbers of medals won by countries in the 1992
Winter Olympics.
3. Last digit of each of 500 students' social security
numbers.
4. Age at death of a sample of 45 persons.
5. The SAT scores of 500 students.
6. The heights in inches of 500 college students.
0
2
4
6
8
10
12
Sleep Time in Hours
5
6
Country
# of Gold Medals
US
40
Russia
32
China
28
Australia
16
Germany
13
France
13
Italy
13
...
...
Mozambique
1
Brazil
0
...
...
Vietnam
0
(Data is for the 80 countries that won
at least one medal of any color.)
7
8
2