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A drug manufacturer markets a brand of pain reliever that it claims to be 95% effective in reliev

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A drug manufacturer markets a brand of pain reliever that it claims to be 95% effective in relieving headache pain. A consumer group decides to select a sample of 20 people at random who suffer from headaches and give them the medicine. They will then count the number of people who indicate to have experienced relief from their pain. Assume that the effect of the drug on each person is independent of the effect on all other people receiving the drug, and that a Binomial model is appropriate.

If the number of people in the sample who experience pain relief is 18 or fewer, the consumer group will publish a report questioning the claim that the drug is 95% effective; otherwise, no results will be published. If ? =.95 as claimed, what is the probability that the sample of 20 people will have 18 or fewer who experience pain relief? (Round your answer to 4 decimal places.)

Select one:

A. .9245B. .8647C. .0755D. .2642E. .7358

 

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Oct 14, 2020

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