Sampling Methods Flashcards
What is a sample?
Group of people that take part in a study
What is generalising?
Concluding that findings from sample will be true for general population
Why does a good sample need to be large?
Reduces impact of random variations amongst participants
When is generation valid?
If the sample is representative of target population
What is opportunity sampling?
Selecting participants based on who’s readily available.
Problem with Opportunity sampling?
It is biased and not representative of target population.
What is random sampling?
Where everyone has the same chance of being picked. considered the best- unbiased and representative.
Problem with random sampling?
Difficult and time consuming
What is systematic sampling?
Uses a procedure that avoids groups of people being selected together.
What is Stratisfied sampling?
Selecting people to maintain overall proportion of target population.
Problem with systematic sampling?
Tends to be representative but not always unbiased
