Stratified sampling, Layers to represent all subgroups, Stratified advantage, More precise for specific groups, Stratified disadvantage, Planning is complex and time-consuming, Systematic sampling, Collecting data at regular intervals, Systematic advantage, Even spread across population, Systematic disadvantage, May miss important variations, Random sampling, Collect data using chance selection, Random advantage, Reduces bias and is fair, Random disadvantage, May miss key subgroups, CBD stratified survey, Residents tourists and business owners, Neighbourhood stratified comparison, High-income and low-income areas, Shopping centre systematic survey, Every 3rd customer in a store, Environmental quality survey systematic, Every second street do an EQS, Beach sediment systematic sampling, Every 5 metres pick measure pebble size, Vegetation stratified survey, Forest edge, middle and clearing, Soil random sampling, Random points in a field to test the soil

Sampling methods and examples

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Statistical vs. Non-Statistical Questions
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sorting materials into groups
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