a. Was this an observational study or an experiment? Justify your answer.

b. Explain why it would not be appropriate to perform a chi-square test in this setting.

For their final project, a group of AP® Statistics students investigated the following question: “Will changing the rating scale on a survey affect how people answer the question?” To find out, the group took an SRS of 50 students from an alphabetical roster of the school’s just over 1000 students. The first 22 students chosen were asked to rate the cafeteria food on a scale of 1 (terrible) to 5 (excellent). The remaining 28 students were asked to rate the cafeteria food on a scale of 0 (terrible) to 4 (excellent). Here are the data: