Tablets vs. Books

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Although a direct survey has yet to be produced, clearly the growing popularity of tablet computers in our country is leading to diminished levels relative to decades past of using that old-fashioned handheld device--that is, reading books. For example, one third of adults in our country now own tablet computers. And even as far back as eight years ago, before tablets had even hit the market, only about half of adults in our country answered affirmatively to a survey question that they happened to be reading a book or novel at the present time.

Each of following would be useful to determine in order to evaluate the argument EXCEPT