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Extra uitgewerkte oefenopdrachten Beschrijvende en inferentiële statistiek - CW

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Extra uitgewerkte opdrachten voor BIS, of met antwoorden, gevolgd aan de Faculteit Sociale Wetenschappen (VU, bachelorjaar 1). Laatste pagina's zijn oefenopdrachten zonder uitwerking!

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College 8 oefeningen




Oefeningen
College 1
Oefening 1




Bij 68%
X+1s=15,09
X-1s=12,37
Dus C.

Oefening 2:




Gewogen gemiddelde berekenen
(8*4)+(13*3)=
(32)+(39)=71
71:21=3,38
Dus B.

Oefening 3:

,Het is dan Modus, mediaan, gemiddelde. Dus A.
Oefening 4:




68%:
Y+1s=33,8
95%:
Y+2S=37,5.
Dus B.

College 2
Oefening 1: Oefeningen, en wat zal de ware gemiddelde lengte zijn van mannen en
vrouwen?




Z-score berekenen:
Z=(x-x̅)/s
Z=(166-170,6)/6,5
Z=-0,71
P-waarde:
P=0,2389
0,2389*100=23,89
Dus 23,89% van de populatie is kleiner dan ik.
Ware lengte vrouwen:
1,96*6,5=12,74

,170,6-12,74=157,86
170,6+12,74=183,34
Dus de ware lengte ligt tussen de 157,86 en 183,34 centimeter.
Ware lengte mannen:
1,96*7=13,72
184+13,72=197,72
184-13,72=170,28
Dus de ware lengte ligt tussen de 170,28 en 197,72 centimeter.
Oefening 2:




Bij s=2000:
Berekenen z-score:
Z=(x-x̅)/s
Z=(43000-30000)/2000
Z=6,5
P-waarde:
6,5*2000=13000

Bij s=10000:
Berekenen z-score:
Z=(x-x̅)/s
Z=(43000-30000)/10000
Z=1,3
P-waarde en kritieke waarde:
P=0,9032
1-0,9032=0,0968
0,0968*100=9,68%
Oefening 3:




Gemiddelde en standaarddeviatie X berekenen:
2+5+6=13

, 13/3=4,33
s=√(x-x̄)2/n-1
s=√((2-4,33)2+(5-4,33)2+(6-4,33)2)/3-1
s=√(5,43+0,45+2,79)/2
s=2,082
Gemiddelde en standaarddeviatie Y berekenen:
1+1+2=4
4/3=1,33
s=0,577
Correlatie formule invullen:



Oefening 4:




Intercept aflezen:
2,5
Slope berekenen:
Deltay/deltax=
(7-2,5)=4,5
(10-0)=10
4,5/10=0,45
Dus 0,45.




Oefening 5:




Y=a+b*x
Y=2,5+0,45*9
Y=6,55
Dus een score van 6,55.

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