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Bar graphs are good for showing how data change over time.
Example:
Advantages
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show each data category in a frequency distribution
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display relative numbers or proportions of multiple categories
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summarize a large data set in visual form
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clarify trends better than do tables
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estimate key values at a glance
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permit a visual check of the accuracy and reasonableness of
calculations
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be easily understood due to widespread use in business and the
media
Disadvantages
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require additional explanation
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be easily manipulated to yield false impressions
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fail to reveal key assumptions, causes, effects, or patterns
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