41
Exercise 2.21
(Solution on p. 47.)
The following box plot shows the U.S. population for 1990, the latest available year. (Source:
Bureau of the Census, 1990 Census)
a.
Are there fewer or more children (age 17 and under) than senior citizens (age 65 and over)?
How do you know?
b.
12.6% are age 65 and over. Approximately what percent of the population are of working age
adults (above age 17 to age 65)?
Exercise 2.22
Javier and Ercilia are supervisors at a shopping mall. Each was given the task of estimating the
mean distance that shoppers live from the mall. They each randomly surveyed 100 shoppers. The
samples yielded the following information:
Javier
Ercilla
x
6.0 miles
6.0 miles
s
4.0 miles
7.0 miles
Table 2.11
a.
How can you determine which survey was correct ?
b.
Explain what the difference in the results of the surveys implies about the data.
c.
If the two histograms depict the distribution of values for each supervisor, which one depicts
Ercilia’s sample? How do you know?
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 Fall '08
 Ripol
 Statistics, supervisor, Shopping mall

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