Suppose a researcher is going to study the effects of marijuana on motor function skills. Fifty subjects of different motor function skills are available for the study, and each subject will be tested before receiving a dose of marijuana and one hour after receiving the dose of marijuana.

(a) Is this study an experiment or an observational study? Explain.

(b) What is the blocking factor in this experiment?

(c) How many blocks are there in this experiment?

(d) What are the treatments in this experiment?

(e) Write out the degrees of freedom table for this experiment.