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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 328<br />

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Studentova porazdelitev<br />

Pri normalno porazdeljeni slučajni spremenljivki X<br />

je tudi porazdelitev X normalna, in <strong>si</strong>cer N(µ, σ √ n ).<br />

Statistika<br />

X − µ √<br />

Z = n<br />

σ<br />

je potem porazdeljena standardizirano normalno.<br />

Pri ocenjevanju parametra µ z vzorčnim povprečjem X<br />

to lahko uporabimo le, če poznamo σ;<br />

<strong>si</strong>cer ne moremo oceniti standardne napake<br />

– ne vemo, kako dobra je ocena za µ.<br />

Univerza v Ljubljani ▲<br />

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☛ ✖<br />

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