Answered: A clinical trial was conducted to test…

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

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 18 subjects had a mean wake time of 101.0 min. After treatment, the 18 subjects had a mean wake time of 91.2 min and a standard deviation of 23.5 min. Assume that the 18 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 101.0 min before the treatment? Does the drug appear to be effective?

a. Construct the 99% confidence interval estimate of the mean wake time for a population with the treatment.

min less than mu less than min

(Round to one decimal place as needed.)

Expert Solution

Step 1

Given information:

$\begin{array}{rcl} {\bar{x}}_{Before} & = & 101.0 \\ {\bar{x}}_{After} & = & 91.2 \\ s_{After} & = & 23.5 \\ n & = & 18 \\ Confidence level & = & 99 % \end{array}$