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Confidence Interval Calculator

Confidence Interval Calculator

Confidence Level Calculator

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Confidence Interval Calculator. Enter how many in the sample, the mean and standard deviation, choose a confidence level, and the calculation is done live.

How It Is Calculated

The Confidence Interval formula is

x̄ ± Z s√n

Where:

  • x̄ is the mean
  • Z is the Z-value from the table below
  • s is the standard deviation
  • n is the number of observations

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