Put differently, these surveys failed the test-as-you-fly rule. Filling out a survey about reading a newspaper, and the actual act of reading a newspaper, are two different things. Gallup knew that for the test to work, it had to closely resemble the flight. So what did Gallup do to remedy the problem? He sent a team of interviewers into people’s homes to watch them read newspapers and mark each part of the paper as read or unread. Awkward? Yes. More accurate than surveys? Absolutely. “Almost without exception,” Gallup wrote, “later questioning proved… preliminary statements [in surveys]
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