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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 605<br />

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Statistično sklepanje o korelacijski povezanosti:<br />

Postavimo torej ničelno in osnovno domnevo:<br />

H0: ρ = 0 (spremenljivki nista linearno povezani)<br />

H1: ρ = 0 (spremenljivki sta linearno povezani)<br />

Pokaˇze se, da se statistika<br />

t = r · √ n − 2<br />

√ 1 − r 2<br />

porazdeljuje po t porazdelitvi z m = (n − 2) prostostnimi stopnjami.<br />

Z r označujemo koeficient korclacije na vzorcu in<br />

z ρ koeficient korelacije na populaciji.<br />

Univerza v Ljubljani ▲<br />

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