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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 44<br />

✬<br />

✫<br />

Varianca in standardni odklon<br />

Varianca populacije (končne populacije z N elementi):<br />

σ 2 =<br />

N<br />

(yi − µ) 2<br />

i=1<br />

Varianca vzorca (n meritvami):<br />

s 2 =<br />

n<br />

(yi − µ) 2<br />

i=1<br />

n − 1<br />

=<br />

N<br />

n<br />

i=1<br />

.<br />

y 2 i −<br />

n <br />

n − 1<br />

Standardni odklon je pozitivno predznačen kvadratni koren<br />

variance.<br />

i=1<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

n<br />

yi<br />

2<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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