SOLUTION: 1.The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 57.6 for a sample of size 84

Question 1189974: 1.The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 57.6 for a sample of size 846 and standard deviation 5.2. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% confidence level). Explain the meaning of the confidence interval in a sentence.

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
90% half-interval is 1.648*s/sqrt(n)=1.647*5.2/sqrt(846)=0.29
(57.31 mm Hg, 57.89 mm Hg) mm Hg are BP units.
We are highly (90%) confident the true value of lowering is in this interval.
If we performed 100 such intervals, 90 would contain the interval; we just wouldn't know which 90.
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