Summarise categorical or continuous data

2-sample t-test for summary data

	Sample 1	Sample 2
Means
Standard deviations
Sample sizes

Desired significance level

Digits after decimal point

1 tailed

2 tailed

Submit

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.