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5.-To assess normality of a data set the following rule is proposed: Use the buterquartile range, IOR, and standard deviation, s, for the sample, then

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5.-To assess normality of a data set the following rule is proposed: "Use the buterquartile range, IOR, and standard deviation, s, for the sample, then calculate the ratio TOR's. If the data are approximately normal, then we have JOR/s = 1.3. (The symbol ) means approximately equal. Find the IOR for the standard normal to show this rule is reasonable

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