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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 394<br />

✬<br />

VI. Majhen vzorec za (1 − α)%-ni interval zaupanja za<br />

razliko µ1 − µ2, kadar ne poznamo odklonov σ1 in σ2, ki pa<br />

sta <strong>si</strong> enaka, vzorci pa so majhni in izbrani neodvisno:<br />

Privzeli smo:<br />

y 1 − y 2 ± t α/2,n1+n2−2<br />

– obe populaciji sta pribliˇzno normalni,<br />

– varianci sta enaki,<br />

– naključni vzorci so izbrani neodvisno.<br />

✫<br />

<br />

s 2 p<br />

1<br />

n1<br />

+ 1<br />

kjer je s 2 p = (n1 − 1)s 2 1 + (n2 − 1)s 2 2<br />

n1 + n2 − 2<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

n2<br />

.<br />

<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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