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Samenvatting statistiek hoofdstuk 3
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goede samenvatting voor toets of examen
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Statistiek: H31. Het gemiddelde
OPGELET:
Gemiddelde bij Relatieve frequentie: niet meer delen door 100
Gemiddelde bij procenten: wel nog delen door 100
Voorbeelden:
Extra: zie groene kader: rekenmachine
2. De mediaan en de modus
Het kiezen van een geschikte centrummaat
Belangrijke regel: maak altijd eerst een grafische voorstelling van je gegevens
Symmetrische verdeling: kan kiezen tussen gemiddelde en mediaan
Scheve verdeling: mediaan = interessanter
Gemiddelde met rekenmachine:
Stap 1: stat > edit
Stap 2: invullen v/d lijst
Stap 3: stat > calc > 1 VAR-stats > L2 > -x (L2 invullen
via scnd)
Stap 4: druk op calculate
3. De spreiding van een verdeling
1. De variatiebreedte R v/e reeks = verschil tussen grootste en kleinste waarde: R = Max – Min
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