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Quantitative Usability, Statistics & Six Sigma by Jeff Sauro



February 24, 2008 | asked by crystal


Question : IQ tests generally have scores in which the mean is 100, and the standard deviation is 16. If your IQ score was 134, what percentage of the population would have a higher IQ than you?

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User Provided Answers & Comments :
March 11, 2008 | Jeff Sauro wrote:

The positive side of the z-score would indicate the percentage of men that WOULD fit, since the question asks, what percent would NOT, you use 100 minus the positive percentage, which is the same as what you're calling the negative side of the z-score.
 
March 4, 2008 | Shelita Taylor wrote:

Update question/answer. The book answer is 0.01% (tech 0.004%). Why is this found on the negative side of the z score vice the positive side?
 
March 4, 2008 | Shelita Taylor wrote:

If a standard doorway is 80 inches and men have a mean height of 69.0 and standard deviation of 2.8, what percentage of men are too tall? The book (Essentials of Statistics 3rd) answer is .0001. Why is the negative side of the z score used vice the positive side?
 


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