1.  random sample(n = noun.cognition) - a sample in which every element in the population has an equal chance of being selected;
is a kind of sample, sample distribution, sampling

2.  random sample(n = noun.cognition) - a sample grabbed at random;
is a kind of sample

at random, grab sample, proportional sample, random, random access memory, random memory, random number generator, random sampling, random variable, random walk, representative sample, sample, sample distribution, stratified sample