3. Interpret the results
All that's left is to carry out the confirmation test.
If the result is very close to, or even identical to, the calculated theoretical answer, then you've done your job properly.
If, on the contrary, you measure a value that seems out of line, then you need to redirect your study by re-examining the factors, levels or interactions.
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ToolReferences
Statistical Method for Research Workers , Ronald Aylmer FISHER, 1925
Statistical methods for scientific research , Ronald Aylmer FISHER, 1946
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