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Testarea ipotezelor statistice Cuprins:
Concepte Procedura Tipuri de erori Etape Teste statistice şi exemple
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Testarea ipotezelor statistice Scopul:
Realizarea unei inferenţe statistice = extinderea rezultatelor obţinute pe baza datelor dintr-un eşantion asupra colectivităţii generale din care acesta a fost extras (estimarea
valorilor
necunoscute
ale
parametrilor
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Concepte
Ipoteza nulă – nulă – ipoteza privind valoarea unui parametru necunoscut sau legea de repartiţie. Ea constă în admiterea caracterului întâmplător întâmplător al deosebirilor, adică în presupunerea că nu există deosebiri esenţiale (conţine întotdeauna o egalitate). egalitate). Ipoteza alternativă – ipoteza contrară ipotezei nule (conţine întotdeauna o inegalitate) inegalitate) Test statistic Calcul bazat pe datele din eşantion şi
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Procedura
Procedura începe cu presupunerea că ipoteza nulă este adevărată. Scopul este de a determina dacă există suficiente dovezi pentru a infera că ipoteza alternativă este adevărată, sau că ipoteza nulă nu poate fi adevărată. Există două decizii posibile:
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Tipuri de erori Există 2 tipuri de erori:
Eroarea de tip 1 apare 1 apare atunci când respingem o ipoteză nulă adevărată. P(eroare de tip 1) = [de obicei 0.05 sau 0.01] reprezintă riscul de tipul 1, nivel sau prag de semnificaţie.
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Tipuri de erori
Eroarea de tip 2 2 apare atunci când nu respingem o ipoteză nulă falsă. P(Eroare de tip 2) = .
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Tipuri de erori Rezultatul testului
H0 Adevărat
H0 Fals
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Etape 1. Stabilirea ipotezelor statistice H 0 şi H 1.
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Etape 5. Luând în considerare nivelul de semnificaţie identifică valoarea critică (două specificat ( )
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General Ipoteza nulă
Ipoteza alternativă Date
Exemplu H0: µ=28 (µ este media necunoscută necunoscută din colectivitatea generală) H0: µ 28
Eşantionul x1, x2, …,xn
Proces în justiţie Acuzatul este nevinovat.
Acuzatul este vinovat. Mărturiile
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Testarea ipotezei privind media populaţiei generale (μ) pentru eşantioane de
volum mare
Exemplu:
Un producător de bomboane preambalează produsele la cutii ce trebuie să aibă
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1. Formularea ipotezelor statistice
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2. Alegerea şi calcularea testului
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3. Regula de decizie
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Testarea ipotezei privind proporţia populaţiei generale (p) pentru
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1. Formularea ipotezelor statistice
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Bibliografie V.Voineagu, E.Ţiţan, R.Şerban, S.Ghiţă , D.Todose, C.Boboc, D.Pele – Teorie şi practică econometrică, Ed. Meteor Press, 2007