Chapter 7 Flashcards
Subset of the population chosen for study
sample
entire group of interest
population
What are the goals of sampling?
external validity
representative of population
economic sample: good estimation at reasonable cost
All members have an equal chance of participating in the study
Representative Sample
Some members of the population are over/underrepresented
Biased Sample
What are the types of Sampling?
Probability
Non Probability
Simple Sampling
random number assigned to person/random picked
needs sampling frame
Systematic sampling
Choosing “every so many”
Cluster
Choosing certain clusters within a population
Collect data for everyone in each cluster
Stratified Random Sampling
targets a particular socioeconomic demographic
choose randomly from each group
ratio of the population of each group vs sample of each is even
Convenience Sampling
people who are easy to contact and are readily available
Quota Sampling
ensured certain number or percentage of people from particular groups are samples
Purposive Sampling
only having certain groups participate
Snowball Sampling
Participants are asked to recommend friends to the study
