A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment, 13 subjects had a mean wake time of 101.0 min. After treatment, the 13 subjects had a mean wake time of95.5 min and a standard deviation of 24.5 min. Assume that the 13 sample values appear to be from a normallydistributed population and construct a 95% confidence interval estimate of the mean wake time for a population withdrug treatments. What does the result suggest about the mean wake time of 101.0 min before the treatment? Does thedrug appear to be effective?CODConstruct the 95% confidence interval estimate of the mean wake time for a population with the treatment.min

The question is about a confidence interval Given : Popl. mean wake time ( μ ) = 101.0 min Randomly…

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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A study of 96 bolts of carpet showed that their average length was 77.5 yards. The standard deviation of the population is 1.6 yards. Which of the following is the 90% confidence interval for the mean length per bolt of carpet?
The principal at a large high school claims that students spend at least 10 hours per week doing homework, on average. To investigate this claim, an AP Statistics class selected a random sample of 250 students from their school and asked them how long they spent doing homework during the last week. The sample mean was 10.2 hours and the sample standard deviation was 4.2 hours. Construct and interpret a 95% confidence interval for the mean time that students at this school spent doing homework in the last week. Based on your interval, what can you conclude about the principal's claim? What is your t* value? Remember to use the conservative DF value.
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