Please see below. I need help with this. A report in a research journal states that the average weight loss of people on a certain drug is 23 lbs with amargin of error of +2 Ibs with confidence level C = 95%.(a) According to this information, the mean weight loss of people on this drug, u, could be as low asIbs.(b) If the study is repeated, how large should the sample size be so that the margin of error would be less than 1 lbs?(Assume o = 9 lbs, and use at least 3 decimal places in your critical value.)ANSWER:

Given: x¯=23Margin of error, E=2C=95%

Answered: (a) According to this information, the…

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 report in a research journal states that the average weight loss of people on a certain drug is 17 lbs with a margin of error of ±3 lbs with confidence level C = 95%. (a) According to this information, the mean weight loss of people on this drug, μ, could be as low as ________ lbs. (b) If the study is repeated, how large should the sample size be so that the margin of error would be less than 1.5 lbs? (Assume σ= 6 lbs.)
Suppose a researcher is interested in the effectiveness of a new drug intended to naturally increase hours of sleep for elderly patients experiencing insomnia. Suppose he collects information from a group of 64 patients and calculates a σ=.8 and a sample average of 6.4 hours of sleep. Is there sufficient evidence to reject the null hypothesis that his treatment is ineffective at increasing hours of sleep above 5 hours with 95% confidence?
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