The pooled proportion estimate is used when the null hypothesis states that the two population proportions differ by some non-zero number.

Pooled Proportion Estimate

A method used to estimate the combined proportion from two or more groups, assuming that the underlying proportions across groups are the same.

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect exists among the variables studied.

Population Proportions

The fraction or percentage of units in a population that have a particular attribute.