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A researcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression. One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. A second sample of rats receives a drug that lowers brain levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats display. The data are as follows.

Control	Low Serotonin
n = 10	n = 15
xbar = 14	xbar = 19
SS = 180.5	SS = 130

a) Does the drug have a significant effect on aggression? Use Alpha = .05.

b) What is Cohen's d?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9991992

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