With this online tool, students adjust the standard deviation and sample size of a normal distribution to see how it will affect a histogram of that distribution. This activity allows students to explore the effect of changing the sample size in an experiment and the effect of changing the standard deviation of a normal distribution. Tabs at the top of the page provide access to supplemental materials, including background information about the topics covered, a description of how to use the application, and exploration questions for use with the java applet.

### General Information

**Subject(s):**Mathematics

**Grade Level(s):**9, 10, 11, 12

**Suggested Technology:**Computer for Presenter, Computers for Students, Internet Connection, Adobe Acrobat Reader, Java Plugin

**Freely Available:**Yes

**Keywords:**normal distribution, histogram, standard deviation, median

**Resource Collection:**CPALMS