Do It Yourself!: The Power of a z-Test

Use the sliders to change alpha (left vertical slider), the population difference between the null hypothesis mean and the alternate hypothesis mean (bottom horizontal slider), and the number of observations (right vertical slider). Notice the changes in statistical power as each slider is moved.

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The applet(s) on this page is from Seeing Statistics,™ an online, interactive statistics textbook. Seeing Statistics is a registered service mark used herein under license. The applet(s) on this page was designed to be used exclusively with Introduction to Probability and Statistics, Eleventh Edition, by Mendenhall, Beaver, & Beaver. (c) 2003, Duxbury Thomson Learning. The applet(s) on this page may not be copied, duplicated, or reproduced for any reason.