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Studies comparing multiple groups (i.e., experimental and control) often examine the efficacy of an intervention by calculating within group effect sizes using Cohen's d.
Adequate control of the Type I error requires that the normality assumption holds, which is often examined by means of a preliminary Shapiro-Wilk test.
So, I did what I often do when I'm feeling lonely (which, intriguingly, may be part of why I feel lonely so often, but we'll examine that another day): I went to the movies.
I often went hungry.
I often wonder that.
I often do.
I often wonder.
I often wondered.
— I often told you so.
I often feel dismayed.'".
I often felt excluded.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com