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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 469<br />

✬<br />

(c) Določi β za območje zavrnitve Y ≥ 8, če je p = 0, 5.<br />

Izračunati ˇzelimo verjetnost, da se bo zgodila napaka 2. vrste,<br />

torej da bomo sprejeli napačno hipotezo.<br />

Ker vemo, da je p = 0,5, velja Y ∼ B(20; 0,5).<br />

Napačno hipotezo bomo sprejeli,<br />

če bo y pri izbranem vzorcu manjˇ<strong>si</strong> od 8.<br />

✫<br />

β = P(y ≤ 7) =<br />

7<br />

<br />

20<br />

0,5<br />

i<br />

i 0,5 i = 0,1316 = 13,16%.<br />

i=0<br />

Univerza v Ljubljani ▲<br />

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