Which of the following characteristics of experiments are not also characteristics of surveys? Check all that apply.
A. Statistical analysis is applied to the results of the study.
B. The study compares two or more treatments (possibly including "no treatment").
C. Data are gathered during the course of the study.
D. The study involves one or more treatment groups and a control group.
E. Replication with different groups of subjects can improve the reliability of the study.
