Graphic Displays and Types of Data
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Categorical Data
places a subject into one of several groups or categories

Quantitative Data
 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

Outliers
 unusual values that do not fi with the rest of the pattern
 May be data entry errors or may be actual uusual variables