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- Compute p
_{1}and p_{2}.

- Compute

- Compute .

- Compute .

- Use a z table to compute the
probability value from z. Note that the correction for continuity is
not used in the test for differences between proportions.

- 1. The two proportions are
independent.

- For the normal approximation to be adequate, π should not be too
close to 0 or to 1. Values between 0.10 and 0.90 allow the
approximation to be adequate.

- For the normal approximation to be adequate, there should be at least 10 subjects per group.

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