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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



March 25, 2008 | asked by Jessica :

Question : what is the value of z score required for a 70% confidence interval?

Answer : For a two-sided confidence interval, the critical value which you'd use can be looked up by inputting .70 in the percentile to z-score calculator  to provide a z-score of 1.04.
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Z-Score3
Confidence Intervals2

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