Researchers want to design a study to compare topical cream (applied to the skin) and a drug taken in capsule form for the treatment of a certain type of skin rash. Sixty volunteers who have the rash agree to participate in the study.
a. If each volunteer is given only one treatment, can the study be double-blind? Explain.
b. If each volunteer is given only one treatment, can the study be single-blind? Explain.
c. Could a double-blind, double-dummy study be done? If not, explain why. If so, explain how it would be done.