1.3 Non-random sampling

Question 1

What happens in quota sampling?

Answer 1

An interview or researcher sleects sample that reflects the characteristic of whole population

Question 2

How would you conduct quota sampling?

Answer 2

Population is divided into groups according to characteristic

Size of each group determines the proportion of sample having that characteristic

You would meet people assess their group after interview to alloclate to appropriate quota

continues until filled

if person refuses to be interviewed or quota full - simply ignore to move onto next person

Question 3

What is opportunity sampling?

Answer 3

Consist of taking samples from people who are avaliable at the time of the study is carried out and fit criteria you are looking for

Question 4

How is opportunity sampling conducted?

Answer 4

First 20 people you meet outside of a supermarket on Monday morning

Question 5

Advantages of quota sampling

Answer 5

• Allows a small sample to be representative of population
• No sampling frame is needed
• Cost-effective
• Easy for comparison between different groups of population

Question 6

Disadvantages of quota sampling

Answer 6

• Non-random sampling can introduce bias
• Population divdied into groups might be costly or inaccurate
• Increasing scope of study group increases number and expense
• Non-responses not recorded

Question 7

Advantages of opportunity

Answer 7

Easy to carry out

inexpensive

Question 8

Disadvantges of opportunity

Answer 8

Unlikely to provide a representative sample

Highly depdent on indvidiual researcher