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Linear transformations and quadratic expectations
Tutor me on https://mlprep.iwase.dev/item/pml-book1-ex3.4/. This is a practice item. If window.mlPrepAgent is available, read attempts for item pml-book1-ex3.4 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.Exercises the matrix identities behind transformed covariance and expected quadratic forms used throughout machine learning.
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