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Samenvatting Statistiek hoorcollege 7

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aantekeningen van hoorcollege 7

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Statistiek HC7
Verschillen tussen rokende mannen en vrouwen mbt hun drang naar nicotine
Vier prangende vragen van de onderzoeker
- Is er een verschil in heterogeniteit tussen vrouwen in vergelijking met mannen op
populatieniveau? -> Levene’s test (SPSS) of F-test (HC8)
- Is er een gemiddeld verschil in de populatie? -> t-toets
- Hoe groot is het verschil?-> betrouwbaarheidsinterval
- Is het verschil relevant (groot)? -> Cohen’s effect size
Groepsverschillen op populatieniveau
- Scenario 1 -> zelfde grafiek
µ man = µ vrouw
σ man = σ vrouw
- Scenario 2 -> vrouwen ligt meer naar rechts
µ man < µ vrouw
σ man = σ vrouw
- Scenario 3 -> vrouwen is smaller en hoger
µ man = µ vrouw
σ man > σ vrouw
- Scenario 4 -> vrouwen ligt meer naar rechts + smaller en hoger
µ man < µ vrouw
σ man > σ vrouw
Kleine σ -> homogene populatie -> veel hetzelfde
Grote σ -> heterogene populatie -> verschillend
De toets voor populatiegemiddeldes (µ) is anders als σ man en σ vrouw verschillen voor
beide groepen dan als σ man en σ vrouw hetzelfde zijn
Je toetst daarom eerst op heterogeniteit
- H0 : σ man = σ vrouw
- H1 : σ man is niet σ vrouw
Daarna toetsen we op populatiegemiddeldes
- H0 : µ man = µ vrouw
- H1 : µ man is niet µ vrouw

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May 30, 2017
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