1.3 Non-Random Sampling

What are the two types of non-random sampling?

• Quota

• Opportunity

What is opportunity sampling?

Taking a sample from people who are available at the time that the study is carried out and who meet the criteria

What are the advantages to quota sampling?

• A small sample represents the population

• No sampling frame required

• Quick, easy and inexpensive

• Allows for comparison between different groups in a population

What are the disadvnatages to quota sampling?

• Can introduce bias

• Population needs to be divided into groups, which can be costly and inaccurate

• Non-responses are not recorded as such

What are the advantages to opportunity sampling?

• Easy to carry out

• Inexpensive

What are the disadvantages to opportunity sampling?

• Unlikely to provide a representative sample

• Highly dependent on individual researcher