# Importance of effect size in the statistical significance

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(i) I was asked to Explain the relationship between statistical significance and effect size.

(2) I was asked to choose one article in the field of Psychology and explain the importance of effect size in the statistical significance of the studies.

A Phenomenological Investigation of Altruism as Experienced by Moral Exemplars

Lisa Mastain

Saybrook Graduate School and Research Center

Journal of Phenomenological Psychology 38 (2007) 62?99

www.brill.nl/jpp

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Your tutorial is 359 words plus an article on the effect of portion sizes on the amount that participants eat in an effort to understand obesity. The article is attached. A brand new (2012) article about reporting effect size is also attached.

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Explain the relationship between statistical significance and effect size.

Statistical significance means that there is a small chance that the results are due to sampling errors rather than a true difference between groups or from expected means. For instance, you can find that students in morning classes perform better than students in night classes. That is, there is a statistically different exam score between the two groups. Now, in order to decide if you "care" about this difference, you need to know the practical effect, the effect size. How many points? This can be expressed in raw scores (how many points out of ...

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