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statistics - Estimating confidence Interval for unknown Variance, Normal distribution - Mathematics Stack Exchange
What is the length of the confidence interval for an unknown population mean and unknown standard deviation, given x̅= 25, s= 5. 02 and n= 16 with 99% confidence interval? - Quora
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Statistic Estimating a Population Variance or Deviation & Confidence Interval (including StatCrunch) - YouTube
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