Sampling Flashcards
(11 cards)
What is Opportunity Sampling ?
People who are available and accessible (to the researcher) to take part in the research.
Strength of Opportunity Sampling :
Quick and easy way to obtain participants.
Weaknesses of Opportunity Sampling:
Not always representative of target population.
Difficult to generalise.
Researched bias (research may be more construed to go to a specific group of people).
What is Random Sampling ?
When every member of the target population has an equal chance of being chosen for the sample.
E.g putting all the names of the target population into a hat and drawing them out to determine what condition they will be placed into.
Strengths of Random Sampling:
Not biased, it is random and everyone has an equal chance to be picked.
More likely to be representative of the target population.
Weaknesses of Random Sampling:
As it is randomly selected it arguably may not be as representative.
Time consuming.
What is Stratified Sampling ?
Researchers first identify the candidates that qualify for characteristics they need to include for their study and then they randomly select them (from those elected candidates).
E.g if a researcher wants to identify different ethnic groups within schools they will found out the proportion of those groups within the school and then select randomly making sure to meet those proportions within their study.
Strengths of Stratified Sampling :
All subgroups are represented.
Weaknesses of Stratified Sampling:
Very time consuming.
Sometimes difficult to identify the subgroups and the proportions of them.
What is Systematic Sampling ?
Using a predetermined system to select participants.
“Every nth person”
E.g Picking every 6th person within a queue.
Strengths of Systematic Sampling :
Unbiased
Objective system
Simple
Save time and money
