# SOLUTION: A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control group and recieves a placedo. A second sample of rats recie

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 Question 622970: A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control group and recieves a placedo. A second sample of rats recieves a drug that lowers brian levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats displays. the data are presented below: a. What are the null and alternative hypotheseses? b. Does the drug have a significant effect on aggression? use an alpha level of .05, two tailed. Low Serotonin N=4 M=22 SS-76 Control N=8 M=14 SS=164 Answer by mykasha(37)   (Show Source): You can put this solution on YOUR website!don't understand your problem