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Applied Statistics - Coggle Diagram
Applied Statistics
W1-1 Sampling
Random sampling
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Stratified sampling
One obtained by separating the population elements into nonoverlapping groups, call strata, and then selecting a simple random sample from each stratum.
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Sources of variation
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Measurement error
When the same sample be measures twice, the results change.
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Sample statistics (all are estimated value from data, not real value)
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