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The branch of political science concerned with the collection classification, and discussion of (esp. numerical) facts bearing on the condition of a state or community.
["statistics, n." OED Online. Oxford University Press]
Image credit [http://data.library.virginia.edu/statlab/]
Data is the raw information from which statistics are created. Statistics provide an interpretation and summary of data and are the results of data analysis.
If you are looking for a quick number to verify a claim, you want a statistic. A statistic will answer "how much" or "how many" and will repeat a pre-defined observation about reality. Statistics are the result of data analysis and usually appear in the form of a table or chart.
Data can be interpreted using statistical procedures to answer “why” or “how” and is used to create new information and knowledge.
Adapted from: http://libguides.lib.msu.edu/datastats