Click on the following links. Please note these will open in a new window.

One sample t-test when σ is unknown
https://www.youtube.com/watch?v=y4bAx-1jn3k
This video was created by Chieh-Chen Bowen.

Introduction to t-distribution
https://www.youtube.com/watch?v=NACUg0PdjIc
Describes the shape and properties of t-distribution including the concept of degrees of freedom.

Confidence Intervals
https://www.youtube.com/watch?v=tFWsuO9f74o
Explains the utility and construction of confidence intervals in the context of inferential statistics.