[1] : WordNet (r) 2.0

random sample
     n 1: a sample in which every element in the population has an
          equal chance of being selected
     2: a sample grabbed at random

[2] : Moby Thesaurus II by Grady Ward, 1.0

78 moby thesaurus words for "random sample":
   accidentality, actuarial calculation, adjunct, adventitiousness,
   barometer, break, casualness, chance, component, contingent,
   cross section, destiny, detachment, detail, division, dole, fate,
   feeler, flukiness, fortuitousness, fortuity, fortune, fraction,
   gamble, good fortune, good luck, hap, happenstance, happy chance,
   heedless hap, how they fall, indeterminacy, indeterminateness,
   installment, item, law of averages, lot, luck, moira, opportunity,
   parcel, part, particular, percentage, pilot balloon, portion,
   principle of indeterminacy, probability, probe, problematicness,
   quadrant, quarter, quota, remainder, risk, run of luck, sample,
   sampling, section, sector, segment, serendipity, share, sound,
   sounder, statistical probability, straw vote, subdivision,
   subgroup, subspecies, the breaks, theory of probability,
   trial balloon, uncertainty, uncertainty principle, weather vane,
   weathercock, whatever comes

Random Sample >> R Words
Random Sample, definition of term: Random Sample
random+sample_pag1.html

Random >> R Words
Random, definition of term: Random
random_pag1.html

Sample >> S Words
Sample, definition of term: Sample
sample_pag1.html

Sample Distribu >> S Words
Sample Distribu, definition of term: Sample Distribu
sample+distribu_pag1.html

Random Numbers >> R Words
Random Numbers, definition of term: Random Numbers
random+numbers_pag1.html

Dynamic Random >> D Words
Dynamic Random, definition of term: Dynamic Random
dynamic+random_pag1.html