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14 cards from this deck
Simplify data, show patterns, compare results clearly
Categorical data
Continuous data
Separated by gaps
Touching (to show continuity)
Frequency
Frequency density
FrequencyGroup Width\frac{\text{Frequency}}{\text{Group Width}}Group WidthFrequency
Difference between upper and lower limits of interval
Frequency=Frequency Density×Group Width\text{Frequency} = \text{Frequency Density} \times \text{Group Width}Frequency=Frequency Density×Group Width
Area of each bar
Distribution and shape of data
Wider bars may not mean more data, just bigger range
Bar chart: gaps; Histogram: touching
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