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sample of 40 observations is selected from a normal population where the population variance is 625. The sample mean is 75. a. Construct a 90% confidence interval for the population mean b. Construct a 95% confidence interval for the population mean c. Construct a 99% confidence interval

sample of 40 observations is selected from a normal population where the population variance is 625. The sample mean is 75. a. Construct a 90% confidence interval for the population mean b. Construct a 95% confidence interval for the population mean c. Construct a 99% confidence interval

MATLAB: An Introduction with Applications
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 sample of 40 observations is selected from a normal population where the population variance is 625. The sample mean is 75.
a. Construct a 90% confidence interval for the population mean
b. Construct a 95% confidence interval for the population mean
c. Construct a 99% confidence interval for the population mean
d. If you wanted a narrower interval, would you increase or decrease the confidence level?

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