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The variance of the quantity p bar sub 2 minus p bar sub 1 is equal to one quarter of the sum of two quantities. The first quantity is the variance of the difference p hat sub 2 1 minus p hat sub 1 1. The second quantity is the variance of the difference p hat sub 2 2 minus p hat sub 1 2.

Back to Appendix B, Sixth Graphic Equation
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