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I have seen “data” used with “show” and with “shows” in the newspaper. For example,
Data show that domestic violence increases when there is a greater unemployment.
Data shows that domestic violence increases when there is a greater unemployment.
Which one is correct?
Please clarify is it grammatically correct to use shows in above sentence.
Data is the plural of datum, therefore, show is correct. But that doesn't mean shows is incorrect.
Use of data as a mass noun (which is treated as singular, grammatically) is widespread and widely accepted, and is probably the more common usage today.
So I would accept either, and expect to see shows more commonly.
