Measuring Usability Homepage
Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



October 29, 2007 | asked by Anonymous :

Question : How do you calculate a z-score on discrete data?

Answer : Divide the total number of defects by the total number of Opportunities to get a proportion. From there, use the Percentile to Z-score calculator to arrive at the area under the normal curve, or the z-score.
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Discrete Data3
Z-Score3

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