Bootstrap Method
The bootstrap generates confidence intervals and estimates sampling distributions by repeatedly resampling from the observed sample with replacement, creating a distribution of bootstrap estimates without assuming a population distribution.
Real World
Spotify's data scientists bootstrap listening-time samples from millions of users to build confidence intervals for average daily play duration without assuming any particular distribution shape.
Exam Focus
Emphasise that bootstrap resamples are drawn with replacement and are the same size as the original sample.
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