Assignment task: In a randomized clinical trial, we are interested in testing whether Drug A performs better than Drug B in terms of promoting weight loss. Participants are randomized to receive either Drug A (standard treatment) or Drug B (new drug) and are followed up 30 days after drug administration.
a. What type of threats to study validity does this design avoid by nature?
b. While this study design avoids some biases, what are two types of bias that might be present in this study? (Hint: these have to do with observation and time observed).
c. How could we avoid these two biases?