SOLUTION: The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 55.8 for a sample of size 29

Question 1182874: The effectiveness of a blood-pressure drug is being investigated.
An experimenter finds that, on average, the reduction in systolic blood pressure is 55.8 for a sample of size 29 and a standard deviation 7.9.
Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level).
Assume that the data is from a normally distributed population.
Enter answer as a tri-linear inequality accurate to 3 decimal places.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
half-interval for 90% confidence is t(df=28, 0.95)=1.701*s/sqrt(n)
=1.701*7.9/sqrt(29)
=2.495 (decimal blood pressures aren't used, if done without a catheter in the artery, have at least 2-3 mm error in precision or repeatability, and the final answer should be an integer; that is the physician in me speaking).
(53.305, 58.295) depression of BP in units mm Hg.

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