A new treatment for cancer was tested in a group of 100 cancer patients. Of the
ID: 3383922 • Letter: A
Question
A new treatment for cancer was tested in a group of 100 cancer patients. Of the 100 patients, 50 were randomly assigned to receive the new treatment, and 50 were assigned to receive the existing treatment. Below is a table of the results:
Outcome
Drug Assignment
Cancer free in 6 months
Still has Cancer after 6 months
New Treatment
30
20
Existing Treatment
15
35
Estimate Pr{Cancer Free in 6 months | New treatment}
Outcome
Drug Assignment
Cancer free in 6 months
Still has Cancer after 6 months
New Treatment
30
20
Existing Treatment
15
35
Explanation / Answer
Outcome Drug Assignment Cancer free in 6 months Still has Cancer after 6 months New Treatment 30 20 Pr = 20/55 =0.36 Existing Treatment 15 35 45 55
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