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1 Lecture 1: CHAPTER 1: SAMPLING AND DESCRIPTIVE STATISTICS Question: What is a statistic? Answer: Any numerical summary measure based on data from a sample; contrasts with a parameter which is based on data from a population. Basic Idea of Statistics The basic Idea behind all statistical methods of data analysis is to make inferences about a population by studying a relatively small sample chosen from it. Sampling (Section 1.1, page 3) STATISTICS deals with the of DATA. Data may arise naturally as observations of “things as they are”, or as a result of a controlled designed experiment. As mentioned, statistical methods are based on the idea of analyzing a sample drawn from a population . For this to work, the collection of data must be done carefully and according to certain rules. We will explore one of these methods, called SIMPLE RANDOM SAMPLING . The
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