## Lesson: Choosing an Appropriate Graph

Developing the Concept

After studying several types of graphs, students must now decide on which type or types might be used for different sets of data.

**Materials:** chart paper and markers or chalkboard and chalk

**Preparation:** On chart paper, the chalkboard, or overhead transparencies, prepare data tables such as the following ones.

Library Books Checked Out | |

October | 642 |

November | 508 |

December | 792 |

January | 556 |

Interval | Tallies |

0—9 | |

10—19 | |

20—29 | |

30—39 | |

40 or more |

Boys | Girls | |

Mystery | 29 | 23 |

Adventure | 35 | 28 |

Science Fiction | 14 | 20 |

Biography | 8 | 17 |

Other | 5 | 3 |

**Prerequisite Skills and Concepts:** In this chapter students have made and interpreted bar graphs, double bar graphs, histograms, line plots, line graphs, and double line graphs. In the past they have worked with pictographs and circle graphs.

**Wrap-Up and Assessment Hints**

Have students review kinds of data for which different kinds of graphs are used.

Have students write answers to questions such as these:

- What kind of graph might you use to show change over time? (line graph)
- If you have data for fifth graders' and eighth graders' favorite colors, what kind of graph might you use? (double bar graph)
- If you have data for people's ages such as 0-9, 10-19, 20-29, and 30-39, what kind of graph should you use? (histogram)
- What kind of graph might you use for data that shows parts of a whole? (circle graph)

Let students explain the reasons for their answers.