lecture1

# lecture1 - Statistics 51 Fall 2008 Class 1 Tue Sept 2...

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Statistics 51 – Fall 2008 Class 1: Tue, Sept 2 Outline for Today Introduction, syllabus Key statistical concepts Types of data; Collecting data Summarizing qualitative data Key Statistical Concepts Statistics : the science of analyzing data. It involves classifying, summarizing, organizing and interpreting numerical information in a concise and informative manner. Descriptive statistics : graphical and numerical methods used to summarize a set of data. Inferential statistics : methods used to draw inferences about characteristics of populations based on data from a sample. Experimental units: objects described by a set of data . e.g., people, objects or events. Population: set of all items of interest in a statistical problem. Sample: subset of units in the population.

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Variable: characteristic or property of an individual experimental unit. Data are the actual measurements or observations of variables. Statistical inference: an estimate or prediction or statement about a population based on data collected in a sample. Measure of reliability: statement about the degree of uncertainty associated with a statistical inference. Example: Cola Wars. Cola Wars” is the popular term for the intense competition between Coca-cola and Pepsi displayed in their marketing campaigns. Their campaigns
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lecture1 - Statistics 51 Fall 2008 Class 1 Tue Sept 2...

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