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Variance means to be different, or inconsistent or divergent. It can also be the state or fact of disagreeing or fighting.
Power analysis can be used to calculate statistical significance. It compares the null hypothesis with the alternative hypothesis and looks for evidence that can reject the null hypothesis.
The variance is always positive. The variance is not directly related to the sign (nor magnitude) of the mean.
When testing the sums of squares of variables which are independently identically distributed as normal variables. One of the main uses of the F-test is for testing for the significance of the Analysis of Variance (ANOVA) or of covariance.
The adjective of significance is significant.The adverb of significance is significantly.