One standard deviation, in this case, is about 17 channels. Martin and Yurukoglu found that if Fox News is, say, channel number 500 in your cable lineup, instead of 517, you will watch an extra 2.5 minutes of Fox News in a week, simply because you will encounter Fox News at an earlier point in your channel surfing.
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If 1,000 people watch an average of 2.5 minutes per week of additional Fox News coverage for this reason, three of them will be persuaded to vote Republican.
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