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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 293<br />

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. . . Vzorčenje<br />

Kdaj vzorec dobro predstavlja celo populacijo?<br />

Preprost odgovor je:<br />

• vzorec mora biti izbran nepristransko,<br />

• vzorec mora biti dovolj velik.<br />

Recimo, da merimo spremenljivko X, tako da n-krat naključno<br />

izberemo neko enoto in na njej izmerimo vrednost spremenljivke X.<br />

Postopku ustreza slučajni vektor<br />

(X1, X2, . . . , Xn),<br />

ki mu rečemo vzorec. ˇStevilo n je velikost vzorca.<br />

Univerza v Ljubljani ▲<br />

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☛ ✖<br />

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