The influence of sample size on the choice of method and interpretation of incubation experiments

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Abstract
1. An equation relating batch size to between‐treatment differences has been adapted for hatchability studies and its implications for research considered. 2. Very large egg batches are required to detect small improvements in the hatchability of good hatching strains. 3. Small‐scale laboratory studies on hatchability are best confined to strains and species of low hatchability in which larger between‐treatment differences may be expected. 4. The results of hatchability studies should always be subjected to tests of statistical significance. 5. There is a strong case for studying continuous variates in the laboratory before proceeding to large‐scale hatchability studies.

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