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Q1) A bio psychologist studies function of the brain chemical serotonin in aggression. One sample of rats serves as control group and receives a placebo. Second sample of rats gets a drug that lowers brain levels of serotonin. Then researcher tests animals by recording number of aggressive responses each of rats display. Data are presented below.
Low Serotonin
Control
n = 4
n = 8
M = 22
M = 14
SS = 76
SS = 164
i) Does drug have significant effect on aggression? Use an alpha level of .05, two tails.
a) Yes
b) No
To test the difference between two means using two mean z test.
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