How Do Error Bars and Systematics Change a Conclusion?

Which uncertainty shrinks with repetition, and which bias survives every repeat?

Separate random scatter from systematic offset before making a precise-looking claim.

Repeated blue stellar spectra are compared with an amber calibration reference beside a working observatory spectrograph. — Vastward artistic scientific reconstruction. Repeated traces and an independent calibration reference introduce precision versus accuracy; the scene is illustrative.

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