In an attempt to gauge public opinion, a company holds a vote among its employees about a new city-wide recycling program. Of the votes cast, 90% are in favor. Which statement best identifies a limitation in using these results to predict the opinion of all city residents?
Not all company employees participated in the vote.
Only employees are included, so the sample does not represent all city residents.
The company did not provide incentives for voting.
The results are based on a single poll.
