OceanCalc

Confidence Interval Calculator

Calculate confidence intervals for population mean estimates.

Sample Data

7 values entered

Confidence Level

Higher confidence = wider interval

About Confidence Intervals

Formula:

CI = x̄ ± z × (s / √n)

A 95% confidence interval means that if you repeated the sampling many times, about 95% of the intervals would contain the true population mean.

Z-values:

  • 90% CI: z = 1.645
  • 95% CI: z = 1.96
  • 99% CI: z = 2.576

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Confidence Interval
95% CI
Confidence Interval25.7993 to 32.2007
Sample Mean29
Margin of Error± 3.2007
Lower Bound25.7993
Upper Bound32.2007
Confidence Level95%
Sample Size7