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Beschrijvende en inferentiele statistiek M1 t/m M5
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1. Welke grafieken passen het beste bij ordinale, nominale variabelen en waarom?
1. Welke grafieken passen het beste bij ordinale, nominale variabelen en waarom?
Taartdiagram (laat percentages zien van elke categorie) en een staafdiagram (laat zien hoe de data verdeeld is dmv de hoogte van de staven).
Deze diagrammen laten de verdeling zien van de observaties in categorieën. Bij een taartdiagram is het meteen zichtbaar wat de modus is door de percentages, maar bij een staafdiagram zijn de exacte nummers zichtbaar. Voor een hoog aantal observaties is de staafdiagram het gunstigst.
1. Z-score
1. Z-score
Aantal standaarddeviaties dat een specifieke observatie verwijderd is van het gemiddelde
(observatie-gemiddelde)/standaarddeviatie
4. De z-verdeling
4. De z-verdeling
De kansverdeling van z-waarden is een normale verdeling met als gem. 0 en standaarddeviatie
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