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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



Statistics Questions & Answers

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There is an answer for this Question What is the formula for finding the t-statistic
Awaiting user Action...no answer posted yet Twenty-seven users completed a task, and each user did so with a combination of two variables, S and V, which can each have a value of "yes" or "no". Pass/fail data was collected for each user with the following results: S=yes, V=yes: 7/8 users passed S=yes, V=no: 1/4 users passed S=no, V=yes: 10/10 users passed S=no, V=no: 4/5 users passed How would one determine which combination of variables is the best (with statistical significance)? If that's not possible, can we show that one combination is statistically significantly worse than the others? What method would be used?
There is an answer for this Question What is the equation to go from a Z-score to a percent? I know how to use the table but i want to know the actual formula/equation.95
There is an answer for this Question What is the basic formula for the z-score other than table of areas?