mental measurement - a generic term used to cover any application of measurement techniques to the quantification of mental functions intelligence test, IQ test - a psychometric test of intelligence; "they used to think that intelligence is what an intelligence test tests" ...
And as with any measurement, a larger sample size yields more reliable results. The contents of your blood (including blood sugar) are not 100% uniform, but are distributed somewhat unevenly, meaning that a smaller sample is more likely to show a difference from your average levels compared to...
mental measurement - a generic term used to cover any application of measurement techniques to the quantification of mental functions intelligence test, IQ test - a psychometric test of intelligence; "they used to think that intelligence is what an intelligence test tests" ...