Evidence-Based Practice / Unit 22 EBP 3183 short lesson, about 20 seconds
Sampling Is Not Assignment
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The idea
Random sampling supports generalising a finding outward. Random assignment supports claiming the intervention caused the difference. A study can have either, both or neither.
In practice
A trial with random assignment and a convenience sample: causal within itself, and hard to generalise.
Where people slip
Conflating the two is the most common sampling error in appraisal. Unit 6's causal claim rests on assignment, not on sampling.
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