SHOW ALL YOUR WORK, and INCLUDE ALL STEPS for hypothesis tests A biopsychologist studies the role...
SHOW ALL YOUR WORK, and INCLUDE ALL STEPS for hypothesis tests
A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control group and receives a placebo. 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 displays. The data are presented below. Does the drug have a significant effect on aggression? Use α = .05. (8 points)
Low serotonin:
n =4
M = 22
SS = 76
Control:
n =8
M = 14 SS = 164
Homework Answers
Standard deviation s =(SS/(n-1))
Test statistic =2.667
since test statistic falls in rejection region we reject null hypothesis
we have sufficient evidence to conclude that drug have significant effect on aggression
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