MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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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