The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, onaverage, the reduction in systolic blood prèssure is 15.5 for a sample of size 421 and standarddeviation 11.6.Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99%confidence level).Enter your answer as a tri-linear inequality accurate to one decimal place (because the samplestatistics are reported accurate to one decimal place).< u <Answer should be obtained without any preliminary rounding.

Answered: Estimate how much the drug will lower a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on
average, the reduction in systolic blood prèssure is 15.5 for a sample of size 421 and standard
deviation 11.6.
Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99%
confidence level).
Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample
statistics are reported accurate to one decimal place).
< u <
Answer should be obtained without any preliminary rounding.

Expert Solution

Step 1

Confidence interval:

It is defined as the range which contains the value of true population parameter. The confidence interval is constructed for various population parameters like population mean, population standard deviation and so on.
The confidence interval can be interpreted as : With a stated level of confidence, it can be said that the true population parameter for which confidence interval is constructed lies with the obtained confidence interval.