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Samenvatting overzicht verschillende testen

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Hierin een duidelijk overzicht wanneer je welke test gebruikt, wat er typerend aan is, hoe je ze kan herkennen, de voorwaarden, eigenschappen,...

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  • January 8, 2024
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  • 2023/2024
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z-test t-test X²-test
standaardnormaalverdeling Student’s t-verdeling
Continue variabele Continue variabele Categorische variabele

Symmetrisch Symmetrisch Assymetrisch (rechtsscheef)
Standardnormale distributie
Bepaald door 2 parameters: µ en σ Enkel bepaald door df=n1 Enkel bepaald door df=k-1
-->n=steekproefgrootte -->k=aantal categorieën
--> als df stijgt --> N -->als df stijgt --> N
σ gekend σ niet gekend  S Voorwaarden voor E
Zowel positieve als negatieve waarden Zowel positieve als negatieve waarden Enkel positieve waarden (rechtszijdig)

Kritieke waarde(n) methode Kritieke waarde(n) methode Kritieke waarde methode
p-waarde methode p-waarde methode (regel van 3) p-waarde methode (regel van 3)
betrouwbaarheidsinterval en hypothesetest betrouwbaarheidsinterval en hypothesetest


H0: µ=µ0 H0: µ=µ0 H0: beantwoord aan vooropgestelde distributie
H1: µ≠µ0 of µ>µ0 of µ<µ0 H1: µ≠µ0 of µ>µ0 of µ<µ0 H1: verschillend van vooropgestelde distributie



Voorwaarden: Voorwaarden: Voorwaarden:
- Normaal verdeeld - Normaal verdeeld - E<1 mag niet
- Continue variabele, of n>100 - Continue variabele, of n>100 - Max 20% E<5


Belang steekproefgrootte!!!
Statistisch significant vs klinisch relevant
Type I en type II fouten
Power : 1- β
-->vergroten door n stijging, α stijging, σ daling
of stijging effect size

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