In the Two-Sample Test for Proportions task, you can determine whether two probabilities are the same. The data analyzed in this example are taken from a study measuring the accuracy of two computer ...

In some situations, a standard (known) value (p 0) is available for the expected proportion of nonconforming items, based on extensive testing or previous sampling. This example illustrates how you ...

Power analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required sample size for ...