Video: Confidence Intervals from Bootstrap Resampling [8 min]

We introduce bootstrap resampling and construct confidence intervals using resampling error, which we can see, in place of sampling error, which we cannot see.

[Illustrated transcript (pdf)]

After you’ve watched this video, you should be able to answer these questions:

• What is bootstrap re-sampling? How do we generate a bootstrap-resample?
• What would happen if we took our re-samples using the ordinary way of sampling (without replacement)?
• What do we notice from the animations shown about bootstrap re-sampling error and sampling error?
• Why don’t we just use sampling error to make our confidence intervals? What do we do instead?
• Does the development in this video demonstrate that bootstrap confidence intervals will work as a way of addressing the “how wrong could we be” problem?

If you couldn’t answer a question, you might find it helpful to look at the Illustrated transcript.