You want to conduct a survey to determine the proportion of eligible voters in California likely to vote for the Democratic presidential candidate in the next election.
• Sample 1: All eligible voters in San Diego County
• Sample 2: All eligible voters in the city of Sonoma
• Sample 3: All eligible voters who respond to a CNN Internet survey
• Sample 4: Every 1,000th person on a complete list of all eligible voters in California
Decide which sample is most likely to be a representative sample, and explain why. Then explain each of the other choices is not likely to make a representative sample for the study.