Any binary division of the sample period will show one group performing better than the other.

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In Multnomah County, Oregon, which begins voting on October 8, Eric Sample, spokesman for the county elections division, says that early voting and the state's 100% vote-by-mail has increased voter participation.

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By setting up a few simple Excel formulas (nothing more complicated than addition and division, you can see what they look like in this sample spreadsheet), you can not only track your maintenance data (what the mechanics did, when they did it, how much it cost, and what the mileage was at the time) but also see your average daily mileage during each period between servicings.

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