This Form generates sample size for tests of Means, Variances, Proportions, Rates, ANOVAs, and Correlation.

**File**provides the ability__Save__or Print the output, or return to the__Main Form__.**Edit**allows__Editing Output Text__by cutting, copying, pasting, and undoing entry.**View**provides the ability to enlarge/reduce the Form size for easier viewing.**Help**provides access to this Website.

- These buttons provide quick access to the following tasks.
- Returns to last Form or the
__Main Form__. -
__Saves__the output to a file. - Prints the Text.
- Copies Selection to the clipboard.
- Pastes Text from the clipboard
- Enlarges/Reduces Form size for easier viewing.
- Brings up the
__Main Form__. - Brings up the Help file.
- Hides the form.

Select this tab to generate sample sizes for One and Two-Sample Means tests.

Select this tab to generate sample sizes for Estimation of a variance or standard deviation, or for One and Two-Sample Variance tests.

The following inputs will be displayed. Enter Alpha, Beta, and the ratio of the Standard Deviations (s1/s2). For One-Sample tests, s2 is the alternative value.

Select this tab to generate sample sizes for Estimation of a Proportion, or for One and Two-Sample Proportion tests.

The following inputs will be displayed. Enter Alpha, Beta, and the Proportions (Pi1/Pi2). For One-Sample tests, Pi(2) is the alternative value.

Select this tab to generate sample sizes for Estimation of a Rate, or for One and Two-Sample Poisson Rate tests.

The following inputs will be displayed. Enter Alpha, Beta, and the Rates (Lambda1 and Lambda2). For One-Sample tests, Lambda2 is the alternative value.

Select this tab to generate sample sizes for ANOVA.

The following inputs will be displayed. Enter Alpha, Beta, Sigma, Delta, and the number of levels or cells of interest.

Enter the desired Alpha value here.

Enter the desired Beta value here.

Enter an estimate of the population standard deviation here.

Enter Delta, the difference in means sought, here.

Select whether a one or two-sample test is desired here.

Select whether a directional or non-directional test is to be conducted.

When this box is checked, a Sample Size (n) edit box will appear. Power will be calculated, based on the entered sample size.

The calculation output is displayed here when is clicked. You may save, print, edit, cut, copy, and paste text in this area.

Performs calculations and displays output.

Select this tab to generate sample sizes for Estimation of a correlation, or for correlation tests.

The following inputs will be displayed. Enter Alpha, Beta, Rho(0), and Rho(1).