When the Current Population Survey asked the adults in its s

When the Current Population Survey asked the adults in its sample of 60,000 households if they voted in the 2008 presidential election, 63.6% said they had. The margin of error was less than 0.5%. In fact, only 61.6% of the adult population voted in that election. Why do you think the CPS resut missed by four times the margin of error?

Solution

This might mean that some people said they had voted, but in fact, they did not.