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places a subject into one of several groups or categories
- Also called numeric
- Numbers are actually numbers --> make sense as numbers and can be used that way
Graphing Categorical Data
- Pie charts and bar charts
- How many or what percentage of individuals are in each category
- How the subjects are distributed across the categories
Graphing Quantitative Data
- Histograms and dot plots can be used for quantiative data
- Describes the distribution of a quantitative variable
What does it mean when a histogram is skewed to the right?
- Long tail to the right
- Generally because individuals are stacked up near a lower limit and unlimited on the upper end
What does it mean when the histogram is skewed to the left?
- Long tail to the left
- Generally because individuals are stacked up near an upper limit and unlimited on the lower end
What does it mean when a histogram is symmetric?
- Tails approximately equal in both directions
- Major cluster far from limits on both ends
What does it mean when a histogram is bimodal?
- Two peaks in the histogram
- Caused by two or more groups
- unusual values that do not fi with the rest of the pattern
- May be data entry errors or may be actual uusual variables