How is a confidence interval calculated in statistics?

  • By calculating the median and the mode
  • By multiplying the sample size by the standard deviation
  • By squaring the sample mean
  • By using the sample mean plus and minus the standard error
A confidence interval is calculated using the sample mean plus and minus the standard error. Specifically, it is calculated by taking the point estimate and adding/subtracting the margin of error (which is the standard error multiplied by the relevant Z-value or T-value).
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