Practice question · Numerical answer
A material test compares three grounds against five binders, with two coats of each combination. How many test panels does that require?
Hints
- Multiply the two factors, then apply the coats.
- Three times five is fifteen.
Show the answer
30
Why
30 panels. The number is worth having before the morning starts, because thirty panels is a fortnight of drying and a large amount of labelling. Factorial designs multiply, and the commonest reason a promising test is abandoned is that nobody multiplied it out first.
Practise Research Methods for Artists
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