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What does statistical significance mean?

Looking for the meaning or definition of the word statistical significance? Here's what it means.

Noun
  1. (statistics) A measure of how unlikely it is that a result has occurred by chance.
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Examples
Chi-square analysis was used to determine the statistical significance of phenotypic differences observed among different genotypes.
All I know about stats is that the definition of statistical significance is something of a moot point.
There were marginal differences in the side effects, with no statistical significance.
We used the Wald statistic to assess statistical significance of the results.
Goodness of fit was assessed by diagnostic plots and the statistical significance of the Pearson chi-square of the fitted model.
The scores for the ascending colon and cecum did not reach statistical significance.

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