When the Current Population Survey asked the adults in its sample of 50,000 households if they voted in the 2000 presidential election, 55% said they had. The margin of error was less than 1%. But, as a matter of fact, only 51% of the adult population voted in that election. Why do you think the CPS result missed by much more than the margin of error?

When the Current Population Survey asked the adults in its sample of 50,000 households if they voted in the 2000 presidential election, 55% said they had. The margin of error was less than 1%. But, as a matter of fact, only 51% of the adult population voted in that election. Why do you think the CPS result missed by much more than the margin of error?

When the Current Population Survey asked the adults in its sample of 50,000 households if they voted in the 2000 presidential election, 55% said they had. The margin of error was less than 1%. But, as a matter of fact, only 51% of the adult population voted in that election.
Why do you think the CPS result missed by much more than the margin of error?




A.
The margin of error accounts for random sampling error only.
B.
The margin for error is not a suitable measure of sampling error.
C.
The margin of error is incorrectly calculated.


Answer: A.
The margin of error accounts for random sampling error only.


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