Sampling Techniques

Question 1

Random sample

Answer 1

Each participant has an equal chance of being selected eg name drawn from a hat

Question 2

Opportunity sample

Answer 2

Asking people who are available at the time to take part eg researchers may ask parents picking their kids up from school

Question 3

Volunteer sampling

Answer 3

Researcher advertises the study and people who see the advert may get in contact and volunteer eg poster or newspaper

Question 4

Systematic sampling

Answer 4

Selecting every nth name from a list

Question 5

Stratified sampling

Answer 5

Selecting people from every portion of your population

Question 6

Advantages opportunistic

Answer 6

Convenient, saves money and tine

Question 7

Opportunistic disadvantage

Answer 7

Unrepresentative of target population, can’t be generalised

Question 8

Advantage random sampling

Answer 8

Unbiased, variables equally divided enhancing internal validity

Question 9

Disadvantage of random sampling

Answer 9

Difficult and time consuming, unrepresentative, what is participants refuse to take part

Question 10

Advantage Systematic sampling

Answer 10

Objective, no bias

Question 11

Disadvantage systematic sampling

Answer 11

Time consuming, participants refuse to take part

Question 12

Advantage stratified sampling

Answer 12

Representative, reflects composition of population

Question 13

Disadvantage of stratified sampling

Answer 13

Time consuming, difficult

Question 14

Advantage of volunteer sampling

Answer 14

Easy, minimal input from researcher, ps more engaged

Question 15

Disadvantage of volunteer sampling

Answer 15

Volunteer buss - likely to please researcher and migh effect how findings can be generalised