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Question 135:



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For the most extreme value you've cited, the probability associated with a z-score of 1.7 is ~91%. With a sample size of 6 this is certainly approaching the boundary of what I'd consider unusual. It is often the case that 2 standard deviations or a probability of 95% are used to identify outliers in regression analysis and other statistical tests. You are reasonably close to this threshold, so if re-examining the extreme data-points is not costly I'd suggest it. Otherwise, this still falls within a reasonable boundary of chance fluctuations.

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