POPULATION & SAMPES

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  • Created by: _Holly98
  • Created on: 12-12-15 11:55

POPULATION & SAMPES

POPULATION LARGE GROUP INDIVIDUALS 

TARGET POPULATION 

REPRESENTITIVE - GENERALISED 

CONTAIN SOME FORM OF BIAS

1 of 6

RANDOM SAMPLE

SOPHISTIACTED

EACH MEMBER EQUAL CHANCE BEING PICKED

NAMES ASSINGED NUMBER - LOTTERY 

STRENGTH 

FREE BIAS

WEAKNESS

DIFFICULT / TIME CONSUMING

UNREPRESENTIVE / MAY NOT WISH TAKE PART

2 of 6

SYSTEMATIC SAMPLE

NTH MEMBER POPULATION SELECTED

SAMPLE FRAME PRODUCED ALPHABETICAL ORDER - NOMINATED EVERY 3RD PERSON TILL COMPLETE

STRENGTHS

AVOID BIAS / NO INFLUENCE WHO IS CHOSEN

FAIRLY REPRESENTITIVE

WEAKNESS

COMLETE REPRENSENTATION NOT POSSIBLE

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STRATIFIED SAMPLING

REFLECTS PROPORTION PEOPLE IN SUB GROUPS

IDENTIFY STRARA PROPORTIONS WORKED OUT

STRENGTHS

AVOID BIAS - RANDOM AFTER STRATA

REPRESENTITIVE REFLECT COMPOSITION POPULATION

GENERALISATION

WEAKNESS

DOESNT REFLEC PEOPLE DIFFERENT

4 of 6

OPPURTUNITY SAMPLE

ANYONE WILLING / CHANCE OR WHO IS AROUND

STRENGTH

CONVENIANT

SAVE TIME / MONEY

WEAKNESS

BIAS - UNREPRESENTITIVE - CANT GENERALISE

BIAS - RESARCHER CONTROL WHO PARTICIPATES

5 of 6

VOLOUNTEER SAMPLE

PARTICPANTS SELECT THEMSELVES

ADVERTISEMENT OR VOLOUNTEER WHEN ASKED

STRENGTH

EASY / MINIMAL EFFORT

WEAKNESS

CERTAIN PROFILE AFFECT GENERALISATION

6 of 6

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