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Common Core Mathematics 6-8 
 ClusterUse random sampling to draw inferences about a population.
  
TopicStatistics and Probability
   Grade 7
  7.SP.1.Understand that statistics can be used to gain information about a population by examining a sample of the population; generalizations about a population from a sample are valid only if the sample is representative of that population. Understand that random sampling tends to produce representative samples and support valid inferences.