Bootstrap Confidence Intervals (CIs)
Sort 500 resampled values and read off two percentiles. That is the whole method, and it works for statistics that have no convenient formula.
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Median
The median describes a typical case and cannot be summed. Both facts follow from it being a position rather than a balance point.
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Percentile
Understand percentiles through ordered observations, with p95 examples, calculation conventions, and aggregation limits.