Download Chapter 3 Displaying and Describing Categorical/Qualitative Data

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

page
1
page
2
page
3
Document related concepts
no text concepts found
Transcript 
Chapter 3
Displaying and Describing Categorical/Qualitative Data
Constructing Bar and Pie Charts
Example
The following data from the 2000 U.S. Census lists the maximum level of
education for Americans over 65. Create two different appropriate displays
for the data and write a few sentences describing any patterns.
Education Level
Count(thousands)
No high school diploma
9945
HS graduate but no college
11701
Some college no degree
4481
2-year degree
1390
4-year degree
3133
Master's degree
1213
PhD or Professional degree
757
Example
A 2001 poll found that many Americans believe in ghosts and other
supernatural phenomena. The poll was based on 1012 randomly selected
adults. The table shows the percentages of people who expressed belief in
various phenomena.
Percent expressing
Phenomenon
belief
Psychic healing
54
ESP
50
Ghosts
38
Astrology
28
Channeling
15
a) Is it reasonable to conclude that 66% of those polled expressed
belief in either ghosts or astrology? Explain.
b) Can you tell what percent of people did not believe in any of these
phenomena? Explain.
c) Is a pie chart an appropriate display for these data? Explain.
d) Create an appropriate display for these data.
Related documents