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A census retains sampling variance · case 02

A census retains sampling variance.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Inputs are nonnegative sample variance s2, integers 1<=n<=population. Return variance of SRS without-replacement mean, rounded to eight decimals; s2 is supplied rather than estimated here.

Why this case matters

A deterministic survey-design model isolates this sampling contract before it is embedded in a larger estimation pipeline.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
half population	`8.0`	`4`	Failed

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