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Question 6 (5 marks) Let A be a symmetric and idempotent matrix with entries a;;. Prove that 0 Question 6 (5 marks) Let 11 be

Question 6 (5 marks) Let A be a symmetric and idempotent matrix with entries a;;. Prove that 0

Question 6 (5 marks) Let 11 be a symmetric and idempotent matrix with entries aij. Prove that O aii 1. Use this to derive limits on thc leverage of a point in thc full rank model.

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