Explain one of the following concepts listed below, as if you were teaching it to a person who has never been lucky enough (like yourself!) to have taken a Stats course before.

1. Sampling Distribution

2. Confidence Intervals

3. How to distinguish between a one-sample t-test versus an independent samples test versus a related samples test

4. Z-scores

5. Standard Error

You just need to explain one of the concepts above. Explain the concept in a short paragraph. You must post your reply before you can see replies from others.