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#stats
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population
collection all individual data
census
statistical analisis of the whole POPULATION
Smaple
a finite subset of the population
parameter
population
statistics
Sample
categorical variable
qualitative variable
numerical variable
quantitative variable
representative sample
a sample that represents well the whole population
simple Random selection (SRS)
every possible sample has same chance to get selected. Done with replacements
Systematic Sampling
select every k-th element of a population
stratified sampling
subdivide population and create sample in each subgroups
cluster sampling
divide population in section and select all elements in specific section
Convenience Sampling
a sample choosing elements with what are easy to obtain an answer
Bad sample
ex: voluntary response sample
cross sectional study
sytudy done at on point in time
times series study
retrospective/prospective study