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Trends in teen drug use.

Collecting, graphing, and analyzing data are key parts of scientific research and reporting. Study the line graph below to analyze national trends in teen drug use from 1996 to 2007. Then answer the questions that follow.

[GRAPHIC OMITTED]

1. The graph shows the percents of 8th-, 10th- , and 12th-graders who reported past-month use of an illicit drug from the years 1992 to 2007.

(A) True

(B) False

2. Overall illicit drug use by 8th-, 10"-, and 12th-graders between 1996 and 2007.

(A) increased

(B) decreased

(C) stayed the same

3. The percentage of 8th-graders using an illicit drug dropped between 1996 and 2007.

(A) about 50 percent

(B) about 25 percent

(C) more than 75 percent

Now try this: Bar graphs are another way to represent data. Like line graphs, bar graphs have a horizontal x-axis and a vertical y-axis. The height of each bar represents a certain value (percent) measured for each group. The table below includes the percentage data that were used to construct the line graph above. Select three separate years from the chart below. Then, on a separate piece of paper, create a bar graph to represent the percentage data of those three years for grades 8, 10, and 12.
 1996 1997 1998 1999 2000 2001

8th Grade 14.6 12.9 12.1 12.2 11.9 11.7
10th Grade 23.2 23.0 21.5 21.2 22.5 22.7
12th Grade 24.6 26.2 25.6 25.9 24.9 25.7

 2002 2003 2004 2005 2006 2007

8th Grade 10.4 9.7 8.4 8.5 8.1 7.4
10th Grade 20.8 19.5 18.3 17.3 16.8 16.9
12th Grade 25.4 24.1 23.4 23.1 21.5 21.9


ANSWERS to Student Worksheet: 1. b; 2. b; 3. a.
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Title Annotation:GRAPHING SKILLS WORKSHEET
Publication:Science World
Geographic Code:1USA
Date:Nov 10, 2008
Words:310
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