When You Hear the Margin of Error Is Plus or Minus 3 Percent, Think 7 Instead

By DAVID ROTHSCHILD and SHARAD GOEL from NYT The Upshot http://ift.tt/2cWPxjv
via IFTTTThere are many ways, besides the well-known sampling error, to get things wrong in polling. October 6, 2016 at 05:00AM