Populations and Samples (VCE SSCE Mathematical Methods): Flashcards

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 $n$ 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)

$p = \frac{\text{number with attribute}}{\text{population size}}$

$\frac{\text{number in sample with attribute}}{\text{sample size}}$