Identify each of the following statements as most likely to apply to single-subject or group research designs.

a. Participants experience both the treatment and control conditions.

b. A good approach when participants respond in unique ways to the experimental intervention.

c. Provide the best level of evidence when researchers use random assignment of subjects to treatment and control conditions

d. Data are usually presented in graphs or tables for individual subjects and often no statistical analysis is completed.

e. Researchers usually report the combined results for all participants.