Z test for proportions
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Revision as of 13:18, 8 July 2011 by Chris Lawrence (talk | contribs)
Revision as of 13:18, 8 July 2011 by Chris Lawrence (talk | contribs)
<math>Z = \frac {p-\pi_0}{\sigma_\pi}</math>, where <math>\pi_0 </math> is the test value.