In constructing a confidence interval estimate of a population mean or testing a hypothesis about a population

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In constructing a confidence interval estimate of a population mean or testing a hypothesis about a population mean, why is the t distribution used so much more often than the normal distribution?
Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...
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Statistical Reasoning for Everyday Life

ISBN: 978-0321817624

4th edition

Authors: Jeff Bennett, Bill Briggs, Mario F. Triola

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