Power & Sample Size Calculator

*using the 1-Sample Z-test method

Use the form below to perform power & sample size calculations. A hypothesis test of the mean, the mu(0) value on the form, when the population standard deviation (sigma) is known. Calculations are based on formulas for the 1-Sample Z-test. If you have questions or problems you can contact Statistical Solutions via E-mail by clicking the following link. Contact Us

Use the 1-Sample Z-test to estimate the mean of a population and compare it to a target or reference value when you know the standard deviation of the population. This method is based on the normal distribution. For small samples, this procedure works best if your data were drawn from a normal distribution or one that is close to normal. You can use this procedure if you have a large sample, substituting the sample standard deviation for the population sigma (σ). Usually, you can consider samples of size 30 or higher to be large samples.

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