representativeness       
noun [ U ] uk/ˌrep.rɪˈzen.tə.tɪv.nəs/ us/ˌrep.rɪˈzen.t̬ə.t̬ɪv.nəs/
 代表性
the fact of a smaller group of people or things representing a larger group accurately, so that the smaller group is typical of the larger one
  There was a question about the representativeness of the sample.
 The number of interviews carried out was too small a number to make any claims to statistical representativeness.  鉴于访谈数量太少,调查不具有统计学意义上的代表性。 
 The random selection process aims to help ensure the representativeness of Canadian criminal juries.
  - More examples
 - Missing data from some schools unfortunately distorted the representativeness of the sample.
 - One theme of the discussion was the notion of representativeness and the need for union officials to reflect the makeup and characteristics of the workers they served.
 - He argued that the exclusion of non-citizens undermines the representativeness of the jury especially with regard to ethnicity.