a number of observations in testing something such as medicine, pills, etc.
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Factors that determine sample size
When something is a sample size, that means it is smaller than the size that is normally available for purchase. Sample size products are usually enough to let you try something before you buy it.
The larger the sample size, the smaller the margin of error.
less bias and error occur when sample size is larger
The larger the sample size, the more accurate the test results.