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 display. The data are presented below. a. Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. b. Use Cohen's d to measure the effect size and evaluate it. Low Serotonin Control n =6 n=8 M = 22 M=14 SS = 108 SS=180 View keyboard shortcuts
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 display. The data are presented below.
a. Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails.
b. Use Cohen's d to measure the effect size and evaluate it.
Low Serotonin Control
n =6 n=8
M = 22 M=14
SS = 108 SS=180
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