Cocaine addiction is hard to break. Addicts need cocaine to feel
any pleasure, so perhaps giving them an antidepressant drug will
help. An experiment assigned chronic cocaine users to take either
an antidepressant drug called desipramine, lithium, or a placebo.
Lithium is a standard drug to treat cocaine addiction. A placebo is
a dummy drug, used so that the effect of being in the study but not
taking any drug can be seen. Here are the results after three
years.
Desipramine
Lithium
Placebo
Relapse
12
21
24
No relapse
16
7
4
What proportion of subjects who did relapse took
Lithium? Round your answer to three decimal
places.
This proportion is part of the
conditional distribution of treatment give outcome
conditional distribution of outcome given treatment
marginal distribution of outcome
marginal distribution of treatment