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Unformatted text preview: • Crashing • decisions have been made • Labs this week! • Website • gauchospace.ucsb.edu • Bedrock principles that have nothing to do with math • Populations and samples • Types of research • Types of variables • What are statistics? • Set of tools, vocabulary, and symbols for communicating about data • Permits one to: • organize, summarize, present, and interpret information • Theory about decision making • How to make judgments when one is uncertain • There are two main branches of statistics • Descriptive Statistics • Tools for summarizing data • Tables & graphs • measures of central tendency • measures of variability • Inferential Statistics • Data from a sample is used to draw inferences about a population • Tools for generalizing beyond actual observations (from a sam ple to a population) • Population • The set of all individuals of interest • Does not have to be humans (could be tires, bears, bugs) • Doesn’t have to be a big group • Sample • A set of individuals selected from a population • Usually intended to represent the population • There are two main sources of data • Political polls • Population: All voters • Sample: The individuals polled • US University Undergraduates • Population: Students at US universities • Sample: UCSB undergraduates • We need to know how to tell the difference between when we are talking about populations and samples • Parameter • Any characteristic coming from a population (e.g., the average) • Usually denoted by a Greek character • Statistic • Any characteristic coming from a sample • Usually denoted by an English character • Although we typically deal with information coming from a sample, we usually want to know something about a population • Because populations are usually too big to completely characterize we have to rely on samples • This is tricky business because of...
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 Fall '08
 COLLINS
 Statistical terminology, ice cream consumption

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