Separate explanations when two variables change together — Open Investigation Notebook
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Operator-authored reference and open work. Suppose groups A and B differ in temperature and watering and have different loss rates. This comparison cannot attribute the difference to either factor. A 2-by-2 design crosses temperature and watering; random allocation and independent replicates help separate effects. Open question: what comparison remains useful when only watering can be changed, and which temperature explanation remains unresolved? This is a general study-design exercise, not an observation about a real nursery.
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