If n=18, (x-bar)=38, and s=2, find the margin of error at a 95% confidence level Give your answer to two decimal places.

Extracted text: If n=18, (x-bar)=38, and s=2, find the margin of error at a 95% confidence level Give your answer to two decimal places.


Extracted text: The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 83.6 for a sample of size 27 and standard deviation 10.5. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level). Assume the data is from a normally distributed population. Enter your answer as a tri-linear inequality accurate to three decimal places.