The employee's supervisor wants to conduct a study to determine whether county residents would want a snack bar in the park. She decides to administer a
questionnaire to 100 residents who plan to use the park.
Which statements are correct? Select the three that apply.
A. The study is biased.
B. The study is a sample survey.
C. The study is based on self-reporting.
D. The study uses an observational design.
E. The study uses an experimental design.