Sampling Flashcards
When is a representative sample of population selected
When it is impractical to measure every individual
What does the extent of natural variation in a population determine
The appropriate sample size that should be taken.
What requires a larger sample size
More variable populations
What should a representative sample have
Share the same mean and the same degree of variation about the mean as the population as a whole
What are the three types of sampling
Random, systematic and stratified sampling
What is random sampling definition
Members of the population have an equal chance of being selected
What is systematic sampling definition
Members of the population are selected at regular intervals
What is stratified sampling definition
The population is divided into categories that are then sampled proportionally( look at pictures in notes)
