Use Power and
Sample Size for 1 Proportion
to examine the relationship between power, sample size, and the comparison proportion when you want to compare the proportion of a population to a target or reference value. These calculations require that your data contain only two categories, such as pass/fail. Use these calculations for the following reasons:
- Before you collect data for a 1 proportions test, to ensure that your test has an adequate sample size to achieve acceptable power
- After a 1 proportions test, to improve the design for the next test
For example, a marketing analyst wants to determine whether mailed advertisements that were sent to a random sample of households result in a response rate that is different from the national average of 6.5% (target value). Before collecting the data for a 1 proportion test, the analyst uses a power and sample size calculation to determine what the power of the test will be with different sample sizes.
Where to find this analysis
To perform a power and sample size calculation for a 1 proportion test, choose