Question

11. A researcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression.  One sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin.  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 as follows.
        Control         Low Serotonin   
     n = 10         n = 15
        M = 14   M = 19
   SS = 180.5  SS = 130.0
a.  Does the drug have a significant effect on aggression?   Use an alpha level of .05, two
tails.
b.  Compute Cohen’s d and r² to measure the size of the treatment effect.
c. Compute a 95% confidence interval for this study.
d. write a brief interpretation of the results in APA style.

Answer 1