## Lesson: Graphing Data

Developing the Concept

Your children have learned how to create tally charts, compare data in tables and charts, and read pictographs. They will now learn to read and create bar graphs and to find range and mode.

**Materials:** The chart-paper “Girl's Hair Color” tally chart and both posterboard pictographs from the Introducing the Concept lesson; 2 versions of a bar graph showing the boys' hair-color data from the previous lesson, one with a scale of 1, the other with a scale of 2; a blank overhead transparency of Learning Tool 10 from the *Learning Tools Folder;* one copy of Learning Tool 10 for each child; crayons

**Preparation:** Make 2 transparency copies of Learning Tool 10, the Horizontal Bar Graph, and one copy for each child. Leave one transparency blank. Create a bar graph on the other, with the data from the Boys' Hair Color survey. Rewrite the numbers on another copy of Learning Tool 10 (give it a scale of 2) and make a transparency. Create a bar graph with the data from the Boys' Hair Color survey.

**Prerequisite Skills and Concepts:** Children should know how to collect data on a tally chart, how to compare data in tables and charts, and how to read a pictograph.

**Wrap-Up and Assessment Hints**

To check children's understanding of the different forms of data representation, have them think of a simple survey question.
Then have them create a tally chart and survey ten classmates. From their tally chart, have the children create a bar graph to show the results of their survey.
Have children present their graph to the class, explaining the range and mode of their data. Allow them to ask the class two or three simple questions about their graphs.