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9 cards from this deck
Cluster: randomly select surgeries, survey all dentists
28 women and 12 men
When expert can pick typical cases, e.g., headteacher
Interval matches a pattern (e.g., every 4th corner house)
Judgement sampling; selected by expert, risk of bias
Opportunity sampling; convenience sample, high bias risk
Quota sampling; sample 28 women and 12 men
Every 4th house (160÷40=4). Beware periodic patterns.
Every 4th house (160 ÷ 40 = 4); check pattern bias.
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