Question

A sample of 117 hypertensive people were given an anti-hypertensive drug, and the drug was found to be effective in 63 of those people. (By effective, we mean that their diastolic blood pressure is lowered by at least 10 mm Hg as judged from a repeat measurement taken 1 month after taking the drug.)

(a) Find a 91% confidence interval for the true proportion of the sampled population for which the drug is effective.

(b) Using the results from the above mentioned survey, how many people should be sampled to estimate the true proportion of hypertensive people for which the drug is effective to within 1% with 96% confidence? (

c) If no previous estimate of the sample proportion is available, how large of a sample should be used in (b)?

Answer #1

A sample of 113 hypertensive people were given an
anti-hypertensive drug, and the drug was found to be effective in
66 of those people. (By effective, we mean that their diastolic
blood pressure is lowered by at least 10 mm Hg as judged from a
repeat measurement taken 1 month after taking the drug.)
a) Find a 94% confidence interval for the true proportion of the
sampled population for which the drug is effective.
b) Using the results from the...

A sample of 127 hypertensive people were given an
anti-hypertensive drug. The drug was effective in 73 of the sample
(Effective meaning blood pressure was reduced by 10 or more after a
repeat assessment (1 month after taking drug).
1) Find the 92% confidence interval for the true proportion of
the sampled population for which the drug is effective. (3
decimals)
2) Using the results from the above survey, how many people
should be sampled to estimate the true proportion...

Mindbender
Anti-hypertensive-Diuretic Case Study
An African-American
65-year old man has a history of diabetes and chronic kidney
disease with baseline creatinine of 2.8 mg/dL. Despite
five different antihypertensives, his clinic blood pressure is
176/92 mm Hg and he has 2-3+ edema on exam. He has been
taking furosemide 80mg twice a day for one year now. He
has mild dyspnea on exertion. At the clinic visit,
hydrochlorothiazide 25mg daily is added for better blood pressure
control and symptoms/signs of fluid overload. Two weeks
later, the...

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