Refer to the quote in the previous exercise, about marijuana and cocaine use in 1980 and 1993.
a. What was the relative risk of cocaine use for college students in 1980 compared with college students in 1993? Write your answer as a statement that could be understood by someone who does not know anything about statistics.
b. Are the figures given for marijuana use (for example, “one in three”) presented as proportions or as odds? Whichever they are, rewrite them as the other.