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Sample size is the number of samples arawn from a population. If you drew 20 samples, your sample size would be 20.
The answer will depend on the units. 20 mm x 8 mm is quite a different size from 20 miles x 8 miles.
8.73 mm
(15 x 20) sq inches.
A phone-call from a public opinion survey of 313 people randomly selected around the USA.