What is a census?
Where 100% of the population is used
What is the aim of a sample?
To ensure the answers represent the same as if you had done a census, must be stastically meaningful and not biased
What are the methods of probability sampling?
Random and systematic
What is random sampling?
Where everyone has an equal chance of selection
What is systematic sampling?
Where every Nth person is used
What are the non probability methods of sampling?
Convenience, Quota, Stratified