For the following questions show all 4 steps to hypothesis testing and show all of your work. Also be sure to name the appropriate test to use (Ind. T, or Depend. T). 19. 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. Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. Low Serotonin Control n = 4 n = 8 M = 22 M = 14 SS = 76 SS = 164
For the following questions show all 4 steps to hypothesis testing and show all of your work.
Also be sure to name the appropriate test to use (Ind. T, or Depend. T).
19. 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.
Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails.
Low Serotonin Control
n = 4 n = 8
M = 22 M = 14
SS = 76 SS = 164
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