Critical Thinking: What's Wrong? In Exercises 21-28, determine whether the study is an experiment or an observational study, and then identify a major problem with the study.

1. School Suspensions The Children's Defense Fund reported that among secondary school students suspended in one region, 67% were suspended at least three times. That statistic was based on three students.
   
   
2. Crime Research A sociologist has created a brief survey to be given to 2000 adults randomly selected from the U.S. population. Here are her first two questions: (1) Have you ever been the victim of a felony crime? (2) Have you ever been convicted of a felony?