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To choose a systematic sample , randomly select a starting point and take every nth piece of data from a listing of the population . For example , suppose you have to do a phone survey . Your phone book contains 20,000 residence listings . You must choose 400 names for the sample . Number the population 1 - 20,000 and then use a simple random sample to pick a number that represents the first name in the sample .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.