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Capital z is equal to the ratio of two quantities. The numerator is p hat sub 1 minus p hat sub 2. The denominator is the square root of the following quantity: the variance of p hat sub1, plus the variance of p hat sub 2, minus twice the covariance of p hat sub 1 and p hat sub 2.

Back to Appendix B, Third Graphic Equation

This page was last updated on May 20, 2008.