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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 232<br />

✬<br />

✫<br />

Standardizirane spremenljivke<br />

Slučajno spremenljivko X standardiziramo s transformacijo<br />

kjer sta µ = EX in σ = √ DX.<br />

XS =<br />

Za XS velja EXS = 0 in DXS = 1.<br />

X − µ<br />

EXS = E<br />

σ<br />

X − µ<br />

DXS = D<br />

σ<br />

X − µ<br />

,<br />

σ<br />

= E(X − µ)<br />

σ<br />

= D(X − µ)<br />

σ 2<br />

= µ − µ<br />

σ<br />

= σ2 − 0<br />

σ 2<br />

= 0.<br />

= 1.<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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