(F) Types of sampling

Question 1

What is random sampling?

Answer 1

members of a population have equal chances of being selected

Question 2

What is systematic sampling?

Answer 2

selecting every nth element in the population

Question 3

What is stratified sampling?

Answer 3

classifying the population into categories then choosing a sample which consists of the same proportions as the original population

Question 4

What is opportunistic sampling?

Answer 4

sample is selected of individuals who are available at the time

Question 5

What are the advantages and disadvantages of random sampling?

Answer 5

• isn’t biased
• can be used in a large group
• easy to do
• can be a poor representation
• certain groups can be missed out
• doesn’t represent everyone

Question 6

What are the advantages and disadvantages of stratified sampling?

Answer 6

• covers all groups
• isn’t biased
• more accurately represents population
• difficult to set up
• people in specific percentages might not be available
• some sections might be too small to be represented

Question 7

What are the advantages and disadvantages of systematic sampling?

Answer 7

• evenly distributed
• easy to do
• provides good coverage of an area
• might not access all areas
• can be biased, certain people can be puposefully left out

Question 8

What are the advantages and disadvantages of opportunity sampling?

Answer 8

• could provide unexpected evidence
• easy to set up and do
• if specific groups of people aren’t needed, anyone can be asked
• may not provide good coverage
• some groups might not be available
• biased