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10 cards from this deck
A group receiving no treatment or a placebo for comparison.
Prevents bias by keeping participants unaware of their group.
By pairing similar individuals, only treatment differs.
Control uses random groups; matched pairs pair similar individuals.
One group gets medication; control gets placebo.
They are time-consuming and hard to set up.
Soil quality, sunlight, or weather conditions.
To isolate the treatment effect by controlling other factors.
Excellent control over individual differences.
Pair bushes by location and size; one gets fertiliser, one not.
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