# The Measurement of Adolescents, II

## Graphing Current Drug Data

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## Exercises

Let the graphs in Figure 10 be an example and use the information in Figures 11,12 and 13 to make line graphs that show the lifetime, annual and thirty-day prevalence trends from 1975-1985 for:

- 1. Does Figure 8 meet the 7 points listed above?
- 2. Make two statements about each of the three graphs in Figure 9. Use complete sentences.

Using the data in Figure 15 make four line graphs showing the grade of first use for:

- 3. marijuana
- 4. cocaine
- 5. Use information in Figure 14. One graph show the trend from 1975 through 1985 for daily use of marijuana, cocaine, alcohol and cigarettes.

(figure 9 available in print form)

- 6. marijuana
- 7. cocaine
- 8. alcohol
- 9. cigarettes
- 10. Make a line graph illustrating the data you collected in exercise 6 of the section Using Tables. Is the bar graph or line graph better for showing this data?

(figure 10 available in print form)

(figure 11 available in print form)

(figure 12 available in print form)

(figure 13 available in print form)

(figure 14 available in print form)

(figure 15 available in print form)

Using Circle Graphs

(figure available in print form)

A circle graph is used to represent a whole quantity such as a budget or the total number of people interviewed in a statistical study. In Figure 16 the whole quantity is 132 schools, the number that participated in the study.

To show how the whole is divided into parts, we divide the circle into sectors. For the circle graph in Figure 16 we used the data from the table in Figure 1. The 1985 senior class had a total of 132 schools, 115 public and 17 private.

Since a circle has 360° and from Figure 1 information we can determine (115/132 x 100) that about 87% of the schools were public, we take 87$ of 360° to know how large a sector we need to represent the number of public schools, 87% of 360 = .87x 360 = about 313°. For private schools we do similarly. 17/132 x 100 = about 13%. 13% of 360 = .13 x 360 = about 47°.

With a protractor we measure the degrees needed and label the graph.

In making a circle graph check the following.

- 1. Since we are dividing a whole into parts, determine what percent of the whole is each part.
- 2. Take the percent of each part times 360° to find how many degrees should be allowed for each sector.
- 3. Draw a circle and divide it into sectors.
- 4. Label sectors with name and percent
- 5. Title graph.
- 6. Is it easy to read?
- 7. Is it neat and attractive?
- 8. Do you need a source credit?
- Exercises
- 1. Using the data from Figure 1 to make a circle graph showing the percent of students who did and did not respond to the High School Senior Survey for 1985.
- 2. The New York Times, 7-27-86, reported that the probable sources of cocaine for 1984 were as follows.

Colombia | 75% | |

Bolivia | 15% | |

Peru | 5% | |

Other | 5% |

- The source was the National Narcotics Intelligence Consumers Committee.
- Make a circle graph illustrating this data.
- 3. Make a circle graph illustrating the percent of smokers and nonsmokers in your class.
- 4. For the number of smokers in you class, make a circle graph illustrating the percent of male and female smokers.