Here is a video by Jim Grange from Youtube.
Note: Video length: 5m:19s
This video includes:
- Explanation of what a t-test is
- How to do a t-test
- Selecting Array 1 and Array 2 of your conditions
- Deciding on a 1-tail or 2-tail test (depending on your hypothesis)
- Type (data representing the same participants or different participants)
- Explanation the t-test equation
- Explanation of the t-test result
- p-value (probability value)
Video source: t-Test in Microsoft Excel.