4. patients who are addicted to cocaine are sometimes using the drug to combat depression. as such, sometimes addicts are given
antidepressant medications to prevent relapse. a three-year study compared the effects of two such medications, lithium and
desipramine, along with a placebo for 72 cocaine users wishing to break the habit. the patients were put into 3 groups of 24, and given 1
of the 3 treatments at random. this two-way table illustrates the results.
treatment relapse no relapse total
desipramine 10
14 24
lithium
6 24
placebo
20
4 24
total
48 24 72
according to the table, 10 of the users who took desipramine relapsed. this number is an example of a
a relative frequency
b. conditional relative frequency
c. marginal frequency
d. joint frequency