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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.