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