Lesson 4 & 5 - Stat 113 Distributions Master...

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Click to edit Master subtitle style 2/16/11 Distributions and their Summary Statistics Stat 113
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2/16/11 Distribution Activ Stats : “The distribution of a variable gives the values the variable can take on, and tells how frequently it takes on each of these values In other words, the distribution tells how frequently individuals take on a given value
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2/16/11 Distribution Distribution of a variable can be viewed Categorical Variables: Bar graph, Pie chart Quantitative Variables: Histogram, Dot plot These help to show the “shape” of the distribution
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2/16/11 Objective C: Inspecting Describe the overall pattern by giving numerical measures of center and spread and a verbal description of shape Assess from a histogram or density curve whether the shape of the distribution of roughly symmetric, or distinctly skewed (left or right), or neither.
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2/16/11 Summaries Numeric summaries of variable distributions help us compare one variable to another Summaries combined with a graphical display are important aids for identifying similarities, differences, and relationships between variables Group 1 Center: Mean Spread: Standard Deviation
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2/16/11 Example: Cigarette Taxes
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Lesson 4 & 5 - Stat 113 Distributions Master...

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