Chapter 1, Problem 36SE

For Exercises 1.39 through 1.44, indicate whether the study is an observational study or a controlled experiment.

A local public school encourages, but does not require, students to wear uniforms. The principal of the school compares the grade point averages (GPAs) of students at this school who wear uniforms with the GPAs of those who do not wear uniforms to determine whether those wearing uniforms tend to have higher GPAs.