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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 543<br />

✬<br />

✫<br />

. . . Analiza variance<br />

Izračunajmo ˇse Q 2 m pri predpostavki o veljavnosti osnovne domneve H0.<br />

Dobimo<br />

Torej je<br />

Q 2 m =<br />

Q2 m<br />

=<br />

σ2 r<br />

ni(Xi − µ) 2 − n(X − µ) 2 .<br />

i=1<br />

r<br />

i=1<br />

ni<br />

Xi − µ<br />

σ/ √ ni<br />

od tu sprevidimo, da je statistika Q2<br />

m<br />

σ 2<br />

2<br />

<br />

X − µ<br />

− n<br />

σ/ √ n<br />

2<br />

porazdeljena po χ 2 (r − 1).<br />

Poleg tega je S 2 m = Q2 m<br />

r − 1 nepristranska cenilka za σ2 , neodvisna od S 2 v.<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

✩<br />

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