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- 2011-7-11
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4#
发表于 2011-7-13 13:57
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Eliminate the obvious one, then flip a coin
Btw, I've done scantron research in the past. It reads the darkest mark, you can fill in all 3 answers and it will select the darkest of the 3. No 2 pencils aren't required anymore (except in old machines), they were needed because marks were read by light shinning through. No.2 led is the right balance of dark and reflective due to the graphite so that it gave the most accurate readings. Newer machines will read pen, pencil, smeared poop, doesn't matter... the darkest mark wins. |
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