# Statistical Significance and Effect Size

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How does effect size impact statistical significance?

What is the importance of effect size in the statistical significance in research studies?

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##### Solution Summary

This solution is 263 words and a reference and shows with a very small data set how significance is easily to find with a large effect size.

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When you have a small sample, variations between data points can be just random variation. In order to be sure that the distance between data points is due to something other than chance, you need a certain number of data points. The number of data points needed to find a difference is related to the size of the difference (effect size).

For example, if you think your entire high school class has all gained weight, how many of that class would you ...

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