lecture09 - Mid-term 1 is available in the statistics...

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Unformatted text preview: Mid-term 1 is available in the statistics workshop Have one week to discuss marking problems Read chapter 10 Suggested problems: 10.3, 10.5, 10.11, 10.23, 10.25 Statistics deals with tools for collecting and understanding data Have discussed ways to collect data How do we deal with the data we collect? Begin by summarizing the data Want to describe or summarize data in a clear and concise way Will first focus on descriptive statistics (graphical and numeric) in chapters 10-14 Interested in something about a population Population is a collection of individuals Describe individuals with data Data sets contain information/facts relating to individuals Variables are attributes of an individual (e.g., hair color, pain severity, ...) Distribution of a variable gives the values the variable can take and how often it takes on each value Two types of variables: Categorical Variables : each individual falls into a category (ethnicity, machine works or does not, ) A special type of categorical data is ordered categorical (ordinal) Categories are ordered in a natural way Can apply ideas of >, < (ordering) Quantitative Variables take on numeric values for which addition and averaging make sense (height, weight, income,). Hair color: Color preference (red=1, blue=2, green=3): Length of time slept:...
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lecture09 - Mid-term 1 is available in the statistics...

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