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In an essay (350-500 words), use the scenario presented above to thoroughly answer the following 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 Cohens d? When is a Cohens 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?

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