Compare two sample proportions using the 2-sample z-test. P-values can be calculated for one or two-tailed comparisons and are compared results to a specified significance level.

Inputs are:

- sample proportions for each sample;

- sample sizes for each sample;

- specified significance level; and

- whether test is one-tailed or two-tailed.

Outputs include:

- difference in sample proportions;

- Asymptotic (normal approximation) confidence limits (based on specified significance level) for the proportions and their difference;

- z and P values for the difference in proportions and their interpretation;

- whether or not z * p values are > 5 (to ensure test validity); and

- a plot of the confidence limits.

86 recent calculations

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