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

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Question 1182976: 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 the data is from a normally distributed population.
Answer as a tri-linear inequality accurate to 3 decimal places.
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
The confidence interval will be given by




53.3+%3C=+X-bar+%3C=+58.3, with the endpoints rounded to 1 d.p.

Note that we used the t-distribution with degree of freedom 29 - 1 = 28, using a 90% confidence level.