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Probability Case Study - Parke-Davis

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Parke-Davis data: A group of 100 people were in a study involved treatment with Lipitor. Unbeknownst to the subjects, some of them were given Liptor and some were given placebo (sugar pill) as shown in the table.

Lipitor (T)...........Placebo (S)
Headache (H) 15..............65
No Headache (N) 17...............3

a) One subject selected, find P(H).
b) One subject selected, find P(T).
c) Two subjects selected, find both used placebo.

d) Find P(H T).

e) Find P(T H).

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