Does drug have significant effect on aggression? use an, Ask an Expert

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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

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