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10 cards from this deck
Complete set of individuals/items we want to study
Smaller subset chosen from the population
Too large, difficult to reach, destructive testing
Faster data collection, lower costs, more practical
Every subset of size nnn has equal chance of being chosen
Subgroups in sample mirror their proportions in population
Constant/fixed for a given population (parameter)
Varies from sample to sample (statistic)
p=number with attributepopulation sizep = \frac{\text{number with attribute}}{\text{population size}}p=population sizenumber with attribute
number in sample with attributesample size\frac{\text{number in sample with attribute}}{\text{sample size}}sample sizenumber in sample with attribute
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