Stats Chapter 2
Terms
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- Frequency Distribution
- tabular summary of data showing the frequency of items
- Relative Frequency
- fraction or proportion of the total number of data items
- Bar chart
- graphical device for depicting qualitative data using bars
- Histogram
- shows quantitative data, has no natural separation between rectangles
- Symmetric Skewness
- left tail is mirror image of right tail
- Moderately Skewed Left
- longer tail to the left
- Moderately Skewed Right
- longer tail to the right
- Highly Skewed Right
- a very long tail to the right
- Cumulative Distributions
- shows the number of items with values less than or equal to the upper limit
- Ogive
- graph of a cumulative distribution
- Crosstabulation
- summary of data for two variables
- Simpsons Paradox
- conclusions based upon an aggregated crosstab can be completely reversed if we look at the unaggreagted data
- Scattter Diagram
- graphical presentation of the relationship between two quantitative variables
- Trendline
- provides an approximation of the relationship