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Census
A survey of the whole population
Judgement Sample
A sample based on the sampler’s judgement and not randomness
Convenience Sample
Samples only those who are convenient to sample, biased
Simple Random Sample
Uses a random number generator
Systematic Sample
Randomly selects one number then every nth person after
Cluster Sample
Randomly selects one item then those around them in a group
Stratified Sample
Sorts people into groups based on characteristics, then selects from each group
Accuracy
Level of bias
Precision
Level of variability
Error
Variability across different samples
Bias
Under or overrepresentation
Pilot Survey
A smaller, test survey done before the real one
