A new drug is designed to reduce a person's blood pressure. Eighteen randomly selected
hypertensive patients receive the new drug. Suppose the probability that a hypertensive
patient's blood pressure drops if he or she is untreated is 0.5.
Then what is the
probability of observing 16 or more blood pressure drops in a random sample of 18
treated patients if the new drug is in fact ineffective in reducing blood pressure? Round
to six decimal places.
Let x = the number of the 18 hypertensive patients whose blood pressure drops.
Then X is a binomial random variable with n = 18 and p = .5.
P(x ?
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