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Least squares, QR, and orthonormal projection
Tutor me on https://mlprep.iwase.dev/item/mit-18-06-s2010-exam2-q2/. This is a practice item. If window.mlPrepAgent is available, read attempts for item mit-18-06-s2010-exam2-q2 before tutoring. Inspect my attempt, keep the item ID, and do not reveal the full answer first. After a real attempt, append its record with recorded_by agent, include agent_session_id when available, and read it back.Tests the derivation and interpretation of least squares rather than formula recall alone.
Source caveat
The official solution's wording about dependent columns can blur the distinction between the unique fitted vector and potentially non-unique coefficient vectors.
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