Statistical Significance (from Internet Glossary of Statistical Terms)

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Statistical Significance
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A finding (for example the observed difference between the means of two random samples) is described as statistically significant, when it can be demonstrated that the probability of obtaining such a difference by chance only, is relatively low. In Psychology, and in many other domains, it is customary to describe one's finding as statistically significant, when the obtained result is among those that (theoretically) would occur no more than 5 out of 100 times when the only factors operating are the chance variations that occur whenever random samples are drawn.

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