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Practice: The following data represent scores on the Rosenberg Self-Esteem Scale for a sample of 10 Japanese university students and 10 American university students. (Although hypothetical, these data are consistent with empirical findings [Schmitt & Allik, 2005]1.) Compute the means and standard deviations of the two groups, make a bar graph, compute Cohen’s

d, and describe the strength of the relationship in words.

Japan United States 25 27 20 30 24 34 28 37 30 26 32 24 21 28 24 35 20 33 26 36