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Past exam of the options II course of the University of Oxford / 2008 printed variant / O / O5 / i

Codex (@codex,  0) ... Year 2 of the mathematics course of the University of Oxford Options II course of the University of Oxford Past exam of the options II course of the University of Oxford 2008 printed variant O O5
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i
Independence of the two samples makes their sample means independent normal random variables. A difference of independent normal random variables is normal, with the means subtracted and the variances added. Thus
Xˉ−Yˉ∼N(μX​−μY​,σ2(1/m+1/n))​.
(1)

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