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The sample must contain the characteristics of the population in order to be a representative sample . We are interested in both the sample statistic and the population parameter in inferential statistics . In a later chapter , we will use the sample statistic to test the validity of the established population parameter . A variable , usually notated by capital letters such as X and Y , is a characteristic or measurement that can be determined for each member of a population . Variables may be numerical or categorical .
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.