Find the Sample Size Required to Estimate a Population Mean With a Given Confidence LevelQuestionSuppose the finishing times for cyclists in a race are normally distributed. If the population standard deviation is 16 minutes,what minimum sample size is needed to be 90% confident that the sample mean is within 5 minutes of the true populationmean?Zo.10Zo.05Zo.025Z0.01Zo.0051.2821.6451.960 |2.3262.576Use the table above for the z-score, and be sure to round up to the nearest integer.

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Answered: Find the Sample Size Required to…

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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we want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately 38.7. We would like to be 99% confident that the estimate is within 4 of the true population mean. How large of a sample size is required ?
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The population standard deviation for the heights of dogs, in inches, in a city is 6.2 inches. If we want to be 92% confident that the sample mean is within 2 inches of the true population mean, what is the minimum sample size that can be taken? z0.10 z0.05 z0.04 z0.025 z0.01 z0.005 1.282 1.645 1.751 1.960 2.326 2.576 Use the table above for the z-score, and be sure to round up to the nearest integer.
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The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population mean of 100 and a population standard deviation of 20. What is the probability we could select a sample of 20 adults and find the mean of this sample is less than 95? 0.1314 0.7372 0.3686 0.7098
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A simple random sample of 64 observations was taken from a large population. The population standard deviation is 120. The sample mean was determined to be 320. The standard error of the mean is _____.

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