Study Guide and Intervention (continued) - MathnMind

1-9
NAME ______________________________________________ DATE ____________ PERIOD _____
Study Guide and Intervention
Statistics: Analyzing Data by Using Tables and Graphs
Analyze Data Graphs or tables can be used to display data. A bar graph compares
different categories of data, while a circle graph compares parts of a set of data as a
percent of the whole set. A line graph is useful to show how a data set changes over time.
Example
The circle graph at the right shows the
number of international visitors to the United States
in 2000, by country.
a. If there were a total of 50,891,000 visitors, how
many were from Mexico?
50,891,000 20% 10,178,200
b. If the percentage of visitors from each country
remains the same each year, how many visitors
from Canada would you expect in the year 2003
if the total is 59,000,000 visitors?
59,000,000 29% 17,110,000
Exercises
1. The graph shows the use of imported steel by U. S.
companies over a 10-year period.
a. Describe the general trend in the graph.
b. What would be a reasonable prediction for the
percentage of imported steel used in 2002?
2. The table shows the percentage of change in worker
productivity at the beginning of each year for a
5-year period.
a. Which year shows the greatest percentage increase
in productivity?
b. What does the negative percent in the first quarter
of 2001 indicate?
Imported Steel as
Percent of Total Used
40
30
20
10
0
1990 1994 1998
Year
Worker Productivity Index
Year (1st Qtr.) % of Change
1997 1
1998 4.6
1999 2
2000 2.1
2001 1.2
Source: Chicago Tribune
© Glencoe/McGraw-Hill 49 Glencoe Algebra 1
Percent
International Visitors
to the U.S., 2000
United
Kingdom
9%
Source: TInet
Others
32%
Japan
10%
Source: Chicago Tribune
Canada
29%
Mexico
20%
Lesson 1-9