Question: “There is strong public support for ‘term limits’ that restrict the number of terms that legislators can serve. One possible explanation for this support is that voters are dissatisfied with the performance of Congress and other legislative bodies. A political scientist asks a sample of voters if they support term limits for members of Congress and also asks several questions that gauge their satisfaction with Congress. He finds no relationship between approval of Congress and support for term limits. Is this an observational study or an experiment? Why? What are the explanatory and response variables?”

(Hint: Look at the surrounding odd numbered problems and their answers at the end of the book. Give similar level of detail in your answer.)