Sampiling Flashcards
What is opportunity sampling
-recruit people who are most convenient or available
What is the strengths of opportunity sampling
Easiest method of recruitment which is Time saving and less costly
What are the limitations of opportunity sampling
-bias as sample is drawn from a small part of the population
What is random sampiling
A sample of pps produced by using a random technique
Strength of random sampiling
Unbiased-all members of the target population have an equal chance of being selected
Limitation of random sampling
Need a list of all members of a target population and contact them so time consuming
What is stratified sampling
A sample of PPS produced by identifying sub - groups
What is a strength of stratified sampiling
More representative
What is a weakness of stratified sampling
Very time consuming for identifying subgroups
What is systematic sampling
A sample obtained by selecting every nth person
What is a strength of systematic sampling
Unbiased - as pps are selected using an objective system
More representative
What is a limitation of systematic sampling
-not truly unbiased
What is volunteer sampling
Pps offer to take part by seeing an advertisement-volunteers o
Strengths of volunteer sampling
More representative and less bias as their is a variety of pps
Limitation of volunteer sampling
Volunteer bias as they’re likely to be more motivated and may. Need money for the motivation to continue
