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SusanAthena, Master's Degree

Category: Calculus and Above

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Experience: Tutor for Algebra, Geometry, Statistics. Explaining math in plain English.

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I know you have answered this for someone before, as that is how I found you. Can I get some assistance with these questions? What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls? What was the purpose of calculating a Cohen's d? When is a Cohen's d calculated? Interpret d=.90. What does it mean in this example? What if the researcher compared the adolescent boys before treatment and again after treating them for depression? What type of t-test would be most appropriate in this case, and why?