Unit 3 - Topic 2 - Experimentation - Section C - Sampling Flashcards
When is a representative sample used
Where it is impractical to measure every individual, a representative sample of the population is selected
What determines the appropriate sample size
The extent of the natural variation within a population determines the appropriate sample size
What do more variable populations require
A larger sample size
What should a representative sample have
A representative sample should share the same mean and the same degree of variation about the mean as the population as a whole
What happens in random sampling
Members of the population have an equal chance of being selected
What happens in systematic sampling
Members of a population are selected at regular intervals
What happens in stratified sampling
The population is divided into categories that are then sampled proportionally.
