Confidence Interval for the Difference Between Means Calculator

confidence interval for a difference between means is a range of values that is likely to contain the true difference between two population means with a certain level of confidence.
The formula to calculate the confidence interval is:
Confidence interval = (x1x2) +/- t*√((sp2/n1) + (sp2/n2))
  • x1, x2: sample 1 mean, sample 2 mean
  • t: the t-critical value based on the confidence level
  • sp2: pooled variance
  • n1, n2: sample 1 size, sample 2 size
To find a confidence interval for a difference between two means, simply fill in the boxes below and then click the “Calculate” button.

95% C.I. = [-2.0049, 3.6049]

You can be 95% confident that the interval [-2.0049, 3.6049] contains the true difference between the population means μ1 and μ2.

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