Confidence Interval for Mean (Z)

Use this calculator to compute the confidence interval for population mean when the population standard deviation is known.

Confidence Interval Calculator for mean
Sample Size ($n$)
Sample Mean ($\overline{x}$)
Population Standard Deviation ($\sigma$)
Confidence Level ($1-\alpha$)
Standard Error of Mean:
Z Critical Value : ($Z$)
Margin of Error: ($E$)
Lower Confidence Limits:
Upper Confidence Limits:

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