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Het volgende laat een voorbeeld zien van het bovenstaande.
(Aantal Elementen: 10)
Gegevenswaarde Frequentie
Cumulatieve
Frequentie
Cumulatieve
Frequentieratio
1 1 1 1/10 = 0,1
2 1 2 2/10 = 0,2
3 2 4 4/10 = 0,4
4 3 7 7/10 = 0,7
5 1 8 8/10 = 0,8
6 1 9 9/10 = 0,9
7 1 10 10/10 = 1,0
3 is de waarde van elementen waarvan de cumulatieve frequentieratio groter is dan 1/4 en
zo dicht mogelijk bij 1/4 ligt, dus Q1 = 3.
5 is de waarde van elementen waarvan de cumulatieve frequentieratio groter is dan 3/4 en
zo dicht mogelijk bij 3/4 ligt, dus Q3 = 5.
Referentiepunt (0,25) Referentiepunt (0,75)
3. Grafieken en berekeningen in verband
met statistische waarnemingen met twee
variabelen
I Een spreidingsdiagram en xy-lijngrafiek tekenen
Ga als volgt om een spreidingsdiagram te tekenen en de punten te verbinden tot een xy-lijngrafiek.
1. Kies in het hoofdmenu de modus STAT.
2. Voer de waarnemingsgetallen in de lijst in.
3. Stel de optie “Graph Type” in op Scat (spreidingsdiagram) of op
xy (xy-lijngrafiek), en teken
de grafiek.
Druk op , ) of op )(QUIT) om opnieuw de lijst met waarnemingsgetallen op te
roepen.
Q1
0,1 0,2 0,4 0,7 0,8 0,9 1,0
Q3
1
2633444 75
Q1
0,1 0,2 0,4 0,7 0,8 0,9 1,0
Q3
1
2633444 75
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