Posted by **dic** on Wednesday, March 17, 2010 at 4:37pm.

In the tests of a new pharmaceutical product, data were collected for use in the approval process required by the U.S. Food and Drug Administration (FDA). Some participants were given a placebo, an inert substance that looks like the drug; others were given the drug. The data are shown in the following table:

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Drug 22 47

Placebo 31 20

What is the probability that

a. the participants perceived that their “medication” helped if they received the drug?

b. the participants perceived that their “medication” helped if they received the placebo?

c. the participants perceived that their “medication” helped?

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