The data:

Treatment Control 10 5 15 9 16 10 16 10 17 14 19 18 20 20

We discussed 2-sample t-tests and confidence intervals, one-sided and two-sided tests, the assumption of equal variances, the formula allowing for unequal variances, and the robustness of t-statistics against departures in the underlying normality assumptions.

Running t-tests in Minitab is simple. The menus are under Stat > Basic Statistics.

Tests of equal variances in two locations, Stat > Basic Statistics > 2 Variances

and

Stat > ANOVA > Test for Equal Variances.

Tests for normality are under
Stat > Basic Statistics > Normality Test