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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. (Hint: Be sure to use the correct test statistic).             Low Serotonin Control n = 4  n = 8 M = 22 M = 14 SS = 76 SS = 164   Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. Be sure to state your conclusion.  Use Cohen’s d to measure the effect size. What is the size of effect?

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. (Hint: Be sure to use the correct test statistic).             Low Serotonin Control n = 4  n = 8 M = 22 M = 14 SS = 76 SS = 164   Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. Be sure to state your conclusion.  Use Cohen’s d to measure the effect size. What is the size of effect?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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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. (Hint: Be sure to use the correct test statistic).

           

Low Serotonin

Control

n = 4

 n = 8

M = 22

M = 14

SS = 76

SS = 164

 

  1. Does the drug have a significant effect on aggression? Use an alpha level of .05, two tails. Be sure to state your conclusion. 
  2. Use Cohen’s d to measure the effect size. What is the size of effect? 

 
 
 
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