Author Question: A new drug is designed to reduce a person's blood pressure. Thirteen randomly selected hypertensive ... (Read 67 times)

mikaylakyoung · **on:** Jul 24, 2018

A new drug is designed to reduce a person's blood pressure. Thirteen 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 11 or more blood pressure drops in a random sample of 13 treated patients if the new drug is in fact ineffective in reducing blood pressure? Round to six decimal places.

Question 2

Let t0 be a particular value of t. Find a value of t0 such that P(t t0 or t t0 ) = .1 where df = 14.

What will be an ideal response?

vkodali · **Reply #1 on:** Jul 24, 2018

Answer to Question 1

Let x = the number of the 13 hypertensive patients whose blood pressure drops.
Then X is a binomial random variable with n = 13 and p = .5.

P(x 11 ) = P(x = 11 ) + P(x = 12 ) + P(x = 13 )
= 0.011230

Answer to Question 2

t0 = 1.761; Use table for t.050 with 14 degrees of freedom.