The left side of the calculator is for statistical testing of two groups on a single variable. The point estimates that are tested can either be percentages or means and can be based either on unweighted or weighted data. The two groups are allowed to overlap. |
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| Reliability for a 50% Proportion |
The right side of the calculator is for estimating degree of reliability around a 50% estimate for a proportion. It either calculates the margin of error given a base size n or calculates the base size n required to attain a specified margin of error. |
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