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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 635<br />

✬<br />

Nepristranska cenilka za regre<strong>si</strong>jski koeficient β je b = Cov(X, Y )/s2 X , ki<br />

ima matematično upanje in standardno napako:<br />

Eb) = β; SE(b) = sY<br />

√<br />

1 − r2 √ .<br />

n − 2<br />

✫<br />

sX<br />

Testna statistika za zgornjo ničelno domnevo je:<br />

t = sY<br />

√<br />

n − 2<br />

√ (b − β0),<br />

1 − r2 sX<br />

ki se porazdeljuje po t-porazdelitvi z m = (n − 2) prostostnimi stopnjami.<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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