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## Using A Cumulative Binomial Table To Find A Sample Size

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The probability that a patient will experience an adverse event is 0.10 (10%). We want to size the study so that we have a sufficient number of patients to be sure (in this case, with 90% probability) to see at least one adverse event. What is the minimum number of subjects needed to observe at least one adverse event with a probability of at least 90%?
So I know that
P=0.1
P(X ≤ 1) = 0.90
I need to find n (minimum sample size)
I have to use a cumulative binomial table to find the answer.
The answer choices are:
20
25
23
21
24
22

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