CHAPTER 9 Â Inference: Estimation
 The essential nature of inferential statistics as verses descriptive statistics is one of knowledge In descriptive statistics the analyst has knowledge of the population data The use of descriptive statistics such as mean mode and standard deviation is typically intended for collapsing the population data for convenience of reporting or interpretation In inferential statistics knowledge about the population is limited to what can be derived from samples For whatever reason both economic and logical reasons it is not possible to view all of the population data so we must examine our sample data and make inferences about the population We can view this process as illustrated in the following figure
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