sampling

Question 1

random sampling

Answer 1

sample selected purely a random

Question 2

advantages of random sampling

Answer 2

• unbiased, everyone has the same chance to be involved - no bias on the part of the researcher
• more representative sample (in theory)

Question 3

disadvantages of random sampling

Answer 3

• more complex - needs a list of all the members of the population
• can be time consuming
• can be difficult to conduct

Question 4

opportunity sampling

Answer 4

taking the sample from people who are available at the time the study is carried out and fit the criteria you are looking for

Question 5

opportunity sampling advantages

Answer 5

• easiest method
• quick - no need to select people due to characteristics
• cheap

Question 6

opportunity sampling disadvantages

Answer 6

• more likely to be biased - only certain types of people might be available

Question 7

self selected sampling

Answer 7

consists of participants becoming part of a study because they volunteered or in response to an advert

Question 8

self selected sampling advantages

Answer 8

• relatively easy
• specifically advertise to people with certain characteristics

Question 9

self selected sampling disadvantages

Answer 9

• more likely to be unrepresentative
• meaning someone is inevitably missed
• known as volunteer bias

Question 10

snowball sampling

Answer 10

find one participant, ask them if they know anyone else who could take part and then pass it on again

Question 11

snowball sampling advantages

Answer 11

• may be effective at targeting difficult to access/identify participants
• can request participants who may possess the features under investigation

Question 12

snowball sampling disadvantages

Answer 12

• time consuming/slow to obtain
• may not represent the target population as they all share similar characteristics