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Unformatted text preview: Lecture 1 Chapter 1 Monday, August 25th Introduction What is Statistics? Where do we use Statistics? Definitions Data is a collection of facts Population is a well defined collection of objects that are of interest When we have available information for all the objects in a population, we have a census When we have available information only on a subset of the population then we have a sample Variable is a characteristic whose value can change from one object to another in a population Univariate Data When the data consists of observations on a single variable. Example: Bivariate Data When the data consists of observations on two variables. Example: We have multivariate data when we have 3 or more variables. Branches of Statistics Descriptive Statistics: When a researcher collects data and he is interested to summarize it and see important features of the data Inferential Statistics: When a researcher collects data and he is interested to reach a conclusion regarding the population of interest Collecting Data...
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 Fall '08
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 Statistics, Probability

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