Answered: Assume that the sample is a simple…

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

Assume that the sample is a simple random sample obtained from a normally distributed population of flight delays at an airport. Use the table below to find the minimum sample size needed to be

95%

confident that the sample standard deviation is within

40%

of the population standard deviation. A histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution affect the sample size?

σ	To be 95% confident that s is within	1%	5%	10%	20%	30%	40%	50%
of the value of σ, the sample size n should be at least	19,205	768	192	48	21	12	8
To be 99% confident that s is within	1%	5%	10%	20%	30%	40%	50%
of the value of σ, the sample size n should be at least	33,218	1,336	336	85	38	22	14

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