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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



October 23, 2007 | asked by Anonymous


Question : How unusual is this event (Z-Score)? A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?

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