When to use the T-Test?
- Standard deviation not known
- Sample size <30
T-test assumes each population has a standard distribution
used to show how changes affect a small sample of a larger population.
useful with experiments and trying to determine the difference in two groups (i.e. using an EdTech tool to teach the same assignment to two different groups).
Paired and Unpaired t-tests. Paired tests for one subject and an unpaired for two groups.