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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



June 16, 2008 | asked by Terry:: Question was Answered in 0 Days 21 Hours & 7 Minutes


Question : I have a data set where n=20. My problem is to find the score at exactly the 75th percentile assuming normality. I know the formula for z-score, the mean, and the standard deviation. How do I do this problem?

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