Random Sampling, A researcher randomly picks 20 students from a school list., A company randomly chooses 30 customers from its database., 10 customer names are picked randomly from a box., Quota Sampling, A researcher needs 20 men and 20 women, so they ask people until they reach the target., A survey needs 10 teenagers and 10 adults, so researchers keep asking until they have enough., A company wants 30 student responses and 20 teacher responses, so they stop when they reach the numbers., Stratified Sampling, A school splits students by year and randomly picks some from each., A company splits customers into age groups and randomly picks from each., A business splits employees by department and randomly selects some from each.

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