Question: Refer to Exercise. In each part, specify the explanatory variable and the response variable.
Exercise: In each situation, indicate whether you think an observational study or a randomized experiment would be used. Explain why in each case.
a. A teacher wants to compare the grade point averages of female students who are in sororities to the grade point averages of female students who are not in sororities.
b. A doctor wants to compare the effectiveness of two allergy medications.
c. A social psychologist wants to determine whether restaurant servers will get better tips if they introduce themselves by name to the people they serve.
d. A child psychologist wants to find out whether there is an association between the amount of television 6-year-old children watch and how often they bully other children in school.