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Samenvatting Analyse en Interpretatie Blok B
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Samenvatting Analyse en Interpretatie geschreven aan de hand van de hoorcolleges.
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Analyse en InterpretatieSpreidingsmaten
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Variantie – gemiddelde gekwadrateerde afwijking van het gemiddelde
- Bruikbaar bij meetniveau’s interval of ratio
- Zegt iet over de afstand van alle waarnemingen t.o.v. gemiddeld
- Uitgedrukt in 1 getal
Formule populatievariantie:
Let op: variantie is σ2 en niet σ!
σ2 (sigma2)= populatie variantie
N= het aantal mensen die zich in de populatie bevindt.
Σ = hoofdletter sigma. De som die wij moeten bepalen van de rekenkundige bewerking die erna staat.
X= een meting
i= het nummer die we aan de meting hebben gegeven
U= populatie gemiddelde
Gemiddelde= eindcijfers opstellen
: aantal studenten
(x-u)= eindcijfer – gemiddelde)
Som is alles opgeteld van die rij.
(x-u2)= (x-u) x (x-u)
Dus -1,833 x -1,833 = 3,361
Delen door 12 is hetzelfde als
vermenigvuldigen met 1:12
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