Solution

The $\text{population}$ contains the set of measurements about which we want to collect information.

$$\textbf{population}

A $\textbf{sample}$ is the part of the set of measurements of which information was actually collected.

SOLUTION

(a) If we were planning to use the results to predict the outcome of the 2012 presidential election, then we would be interested in the vote of all voters nationwide.

(b) The results are based on a sample of 907 registered voters nationwide and thus the actual population from which the sample was taken is the vote of all registered voters nationwide.

(c) "Registered voters" are all voters who are eligible to vote, but they will not necessarily actually vote on election day.

"Likely voters" are voters who are likely to go vote, which implies that there vote will more likely be an actual vote on election day.

(d) The sample selected is not representative of the population described in part (a), because most registered voters will not actually go vote and thus the opinion of the non-voters could differ from the opinion of the actual voters (as people with the strongest opinions tend to actually go vote).

Answer

(a) The vote of all voters nationwide.

(b) The vote of all registered voters nationwide.

(c) "Registered voters" are all voters who are eligible to vote, while "Likely voters" are voters who are likely to vote.

(d) No

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