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 18 6 24
placebo 20 4 24
total 48 24 72
according to the table, 48 of the addicts relapsed regardless of the treatment given. this number is an example of a
a. relative frequency.
b. conditional relative frequency.
c. marginal frequency.
d. joint frequency.