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Cours 7

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Test sur une variance ou un écart type d’une<br />

population<br />

On calcule la statistique du Khi-deux:<br />

On compare cette statistique à 2 1-/2(n-1) d.l.<br />

et à 2 /2(n-1) d.l.<br />

1<br />

2 = ( n <br />

<br />

)s<br />

2<br />

<br />

2<br />

Règle de décision<br />

Test bilatéral<br />

H 0 : 2 = 0<br />

2<br />

H a : 2 0<br />

2<br />

On rejette H 0 si 2 > 2 /2 ou 2 < 2 1-/2

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