Confidence Intervals by Hand: 95% CI for a Population Mean - Sigma Known

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This short video details how to construct a 95% confidence interval for a population mean when the population standard deviation has been given. In particular, the confidence interval is an interval that relies upon a standard normal distribution z-score.
  1. Maths and Stats
  2. Confidence Intervals
  3. 95% Confidence Interval
  4. Population Standard Devaition Known
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The following is a list of 15 scores of an achievement test.
38, 46, 50, 31, 22, 17, 56, 67, 29, 38, 37, 48, 50, 47, 41.
Find the 95% confidence interval of the population mean.

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