Claremont Graduate University's WISE Project's Statistical power for a one-sample z test applet

Simple Instructions for using the power applet

• Click on a Text Field Label for HELP. Click again to remove the description.
• To move the hypthesized alternative distribution, click on the distribution and drag.
• To increase sample size, the n thermometer can be used with the mouse. Click on a desired height in the n thermometer to change the sample size.
• Clicking on the power thermometer will change the sample size by 1. If the mouse click is above the level of power, sample size will be increased by 1. If the mouse click is below the power level sample size will be decreased by 1.

To enter data into a text field:

1. Erase the old field information
2. Enter the new values for that field
3. Press return. If you do not press return, the field will not be updated with the new value.