2-sample t-test for summary data

Input Values


Compare sample means using the 2-sample t-test for summary values. P-values can be calculated for one- or two-tailed comparisons, or compare results to a specified significance level.

Inputs are:

  • mean values for each sample;
  • standard deviations for each sample;
  • sample sizes for each sample;
  • specified significance level;
  • number of digits to display in results; and
  • whether test is one-tailed or two-tailed.
Outputs include:
  • Difference in sample means;
  • standard deviation and standard error of the difference;
  • Confidence limits (based on specified significance level) for the means and their difference; and
  • t and P values for the difference in means and the apropriate number of degrees of freedom; and
  • a plot of the confidence limits.

Summary data:
  Sample 1 Sample 2
Standard deviations:
Sample sizes:
Desired significance level:
Digits after decimal pt:
One-tailed Two-tailed


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