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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 297<br />

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✫<br />

Osnovni izrek statistike<br />

Spremenljivka X ima na populaciji G porazdelitev F (x) = P (X < x).<br />

Toda tudi vsakemu vzorcu ustreza neka porazdelitev.<br />

Za realizacijo vzorca (x1, x2, x3, . . . , xn) in x ∈ R postavimo<br />

K(x) = {xi : xi < x, i = 1, . . . , n} in Vn(x) = K(x)/n.<br />

Slučajni spremenljivki Vn(x) pravimo vzorčna porazdelitvena funkcija.<br />

Ker ima, tako kot tudi K(x), n + 1 moˇznih vrednosti k/n, k = 0, . . . , n,<br />

je njena verjetnostna funkcija B(n, F (x))<br />

<br />

n<br />

P (Vn(x) = k/n) = F (x)<br />

k<br />

k (1 − F (x)) n−k .<br />

Univerza v Ljubljani ▲<br />

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☛ ✖<br />

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