Samples are variable. If you take two (or three) separate samples from the same population, the samples will be different from one another because they will contain different individuals, attributes, and sample means. As a result, using different samples to predict population parameters will result in different estimates of those parameters. For example, the following image shows a population of 100 people. The population has been stratified for ethnicity and gender based on data from the US Census Bureau 2010 for the United States. Total PopulationSample1Sample2Sample3 Data source: Ethnic and gender distributions based on data from the US Census Bureau. 2010. "State