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Past exam of the mathematics course of the University of Cambridge / 2019 / ib / Paper 3 / 20H / a / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2019 ib Paper 3 20H a
Created 2026-09-24 Updated 2026-09-29  0 By others on same topic  0 Discussions Create my own version
The sample mean is
X∼N(μ,nσ2​)​.
(1)
Write the Gaussian sample vector as its orthogonal projection onto the span of (1,…,1) plus its projection onto the orthogonal complement. These two Gaussian projections are independent. Their squared standardized lengths give Cochran's theorem:
σ2SXX​​∼χn−12​,X is independent of SXX​​.
(2)

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