Sampling

Question 1

Population

Answer 1

Large group of people the researcher is interested in studying

Question 2

Sample

Answer 2

Smaller group from the target population

Question 3

Random sampling

Answer 3

Everyone in target population has an equal chance on being selected

How- complete list of members from target pop- assign them numbers- random number generator
+ avoids researched bias
- unrepresentative/ selected may refuse

Question 4

Systematic sampling

Answer 4

Every nth member is selected
How- sample frame (list of ppl)- chose nth people- interval random to reduce bias
+ avoids researched bias
- if every 4th is male, you have an all male sample

Question 5

Opportunity sample

Answer 5

Selects anyone available and willing
How- interviews on the street
+ convenient, saves time and money
- unrepresentative/ researcher bias

Question 6

Volunteer sample

Answer 6

Ptps self select from advert
How-advert, newspaper ect
+ easy, minimal input
- demand characteristics of self selecting

Question 7

Stratified sample

Answer 7

Researched divided target pop into sections, each representing a key group that should be present in the final sample
+ avoids researcher bias
- sub group can’t reflect all the ways people are different