Chapter 4: Implied Main Ideas

Mastery Test 2

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2. (1) A line graph shows changes, especially changes over specific time periods. (2) It might show outdoor

temperatures hour by hour, or weight loss week by week. (3) Bar graphs display and compare amounts: the higher or

longer a bar, the greater the amount. (4) A bar graph might show, for instance, the number of male and female smokers

in several age groups, or death rates from various causes. (5) A circle or “pie’ graph shows parts of a whole. (6) Each

sector of the circle-each wedge of the pie-is one part. (7) Circle graphs are often used for budgets: 50 percent for

rent, 25 percent for food, and so on. (8) They’re also used for polls: for instance, 45 percent “yes,” 40 percent “no,” and

15 percent “undecided.”

The implied main idea of the selection is

a. The sectors of a circle graph look like wedges of a pie,

b. Line graphs, bar graphs, and circle graphs are used to show different kinds of information

c. Line graphs are the most useful kind of graph,

d. We often see line graphs, bar graphs, and circle graphs in newspapers, magazines, and textbooks.

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