A profile group wanted to test the effectiveness of anti-gun ownership commercial. Two random samples, each of 250 respondents, were recruited in Houston. One group was shown the anti-gun ownership commercial. Then, attitudes toward gun ownership were measurement for respondents in both groups.
a. Identify the independent and dependent variables in this experiment.
b. What type of design was used?
c. What are the potential threats to internal and external validity in this experiment?