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9-5-07 - Raw Data – unorganized data Frequency...

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9/5/07 Biased Sample – sample that does not fairly represent population Selecting a Random Sample – all members of population have equal chance of getting picked The Sampling Frame – list of members of population Ways of Selecting Random Sample: Table of random numbers Types of Data: Qualitative – describe characteristic with no numerical example (gender, race…) o Called nominal or categorical data Quantitative – numerical o Two Types: Continuous – any value Discrete – positive integers Descriptive vs. Inferential Statistics 9/12/07 Chapter 3: Graphical Display of Data
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Unformatted text preview: Raw Data – unorganized data Frequency Distribution – shows number of times each value appears Frequency Table – divides data into categories and classes Rf i = frequency of i th classification = fi Describes samples Visual Charts and Graphs How to draw conclusion about population based on the sample Probability theory – likelihood of drawing conclusion based on population Classification Frequency Relative Frequency Freshman 4 4/28 Sophomore 12 12/28 Junior 2 2/28 Senior 10 10/28 N n...
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