Methods of sampling

Question 1

Quota sampling

Answer 1

Choose who to interview
- not random, based on convenience or judgement

Set quotas for specific segments and collect samples untill quota is filled

Example of when to use
- wedding dress company

Question 2

Random sampling

Answer 2

Use random computer to decide
- eliminates bias

Every member of the population has an equal chance of selection

Representative
- confidence in results

Example of when to use
- affinitywater, virgin, british gas

Question 3

Stratified

Answer 3

Population is divided into distinct subgroups
- based on characteristics

Random samples are drawn proportionally from each group

Example when to use
- business launching a new product, want to test reception in different segments
- hotels