Laboratory / Physics
Measurement and uncertainty
Measure a repeated interval with a simulated instrument. Separate resolution, random scatter, and a hidden zero offset, then explain which uncertainty each diagnostic can reveal.
What changed
28 repeated trials cluster around a reference shifted by -15 instrument steps. Repetition alone cannot remove that shared offset.
Return to the route
Experiment after prediction.
Before changing a control, say which visible feature should move and which should remain invariant. That prediction is the useful part of the experiment; motion alone is not evidence.