Problem 5. (1 point) A random sample of 45 measurements was selected from a population with standard deviation 14.4 and unknown mean u. Find a 99 % confidence interval for u if the sample mean was 76.7 Note: You can earn partial credit on this problem.

Problem 5. (1 point) A random sample of 45 measurements was selected from a population with standard deviation 14.4 and unknown mean u. Find a 99 % confidence interval for u if the sample mean was 76.7 Note: You can earn partial credit on this problem.

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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Problem 5.
(1 point) A random sample of 45 measurements
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confidence interval for u if the sample mean was
76.7
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A random sample of size 32 is selected from population X, and a random sample of size 43 is selected from population Y. A 90 percent confidence interval to estimate the difference in means is given as (−1.25,0.87). Consider a change in the sample sizes such that a random sample of size 52 is selected from population X and a random sample of size 63 is selected from population Y. When all other things remain the same, what effect would such a change have on the interval?
A random sample of size 32 is selected from population X, and a random sample of size 43 is selected from population Y. A 90 percent confidence interval to estimate the difference in means is given as (−1.25,0.87)(−1.25,0.87). Consider a change in the sample sizes such that a random sample of size 52 is selected from population X and a random sample of size 63 is selected from population Y. When all other things remain the same, what effect would such a change have on the interval? A) The width of the interval will increase. B) The width of the interval will decrease. C) The interval will contain no negative numbers. D) The level of confidence will increase. E) The sample means will increase.
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