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Summarise categorical or continuous data

2-sample t-test for summary data

  Sample 1 Sample 2

Standard deviations

Sample sizes

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;
  • t and P values for the difference in means and the appropriate number of degrees of freedom; and
  • a plot of the confidence limits.