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Definition: In statistics, sample in which each individual measured or recorded is independent of all other individuals and also independent of prominent features of the area or other unit being sampled.
Context: Un o effeithiau'r cynllun cymhleth hwn a phwysoli'r arolwg yw bod y gwallau safonol ar gyfer amcangyfrifon yr arolwg yn gyffredinol uwch na'r gwallau safonol a fyddai'n deillio o sampl syml a ddewiswyd ar hap o'r un maint.
