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

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
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