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What is the independent variable

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Spanish researchers reported the following: "Using the Mann-Whitney nonparametrical statistical test on the gender differences, we found a significant difference between boys and girls in Group 1 for overall [aggression] (U = 44.00, p = 0.004) and received aggression (U = 48.00, p = 0.005). So, in their dreams, younger boys not only had a higher level of general aggression but also received more severe aggressive acts than girls of the same age" (emphasis in original) (Oberst, Charles, & Chamarro, 2005 p. 175).

a. What is the independent variable, and what are its levels? What is the dependent variable?

b. Is this a between-groups or within-groups design?

c. What hypothesis test did the researchers conduct? Why might they have chosen a nonparametric test? Why do you think they chose this particular nonparametric test?

d. Describe what they found in your own words.

e. Can we conclude that gender caused a difference in levels of aggression in dreams? Explain. Provide at least two reasons why gender might not cause certain levels of aggression in dreams even though these variables are associated.

Reference no: EM131747583

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