Sampling

Question 1

What are the 5 key types of sampling?

Answer 1

• Opportunity
• Random
• Systematic
• Stratified
• Volunteer

Question 2

What is opportunity sampling?

Answer 2

Sample is taken from those who are available at the time. Participants fit the criteria the researcher is looking for

Question 3

What are the strengths of opportunity sampling?

Answer 3

• Convenience- quick and easy

Question 4

What are the limitations of opportunity sampling?

Answer 4

• May not be representative
• Researcher bias

Question 5

What is random sampling?

Answer 5

Every member of the population has an equal chance of being chosen. Researcher makes a list of names and choose randomly (e.g. lottery method)

Question 6

What are the strengths of random sampling?

Answer 6

• Mostly unbiased

Question 7

What are the limitations of random sampling?

Answer 7

• Unrepresentative
• Somewhat biased
• Participant refusal

Question 8

What is systematic sampling?

Answer 8

Involves selecting every nth person from the entire population

Question 9

What are the strengths of systematic sampling?

Answer 9

• Removes researcher bias

Question 10

What are the limitations of systematic sampling?

Answer 10

• Participant refusal
• Time consuming

Question 11

What is stratified sampling?

Answer 11

Classifying the population into categories and choosing a sample consisting of participants from each category

Question 12

What are the strengths of stratified sampling?

Answer 12

• More representative
• Can be generalised

Question 13

What are the limitations of stratified sampling?

Answer 13

• Time consuming
• Not 100% representative

Question 14

What is volunteer sampling?

Answer 14

Participants volunteer when asked by researcher- e.g. advert

Question 15

What are the strengths of volunteer sampling?

Answer 15

• Participants are willing and motivated
• Quick and easy to carry out

Question 16

What are the limitations of volunteer sampling?

Answer 16

• Unrepresentative
• Volunteer bias