Quote:
Look at it as a focus group.
Interviewing 5000 people would most likely cost about 8 times as much in time and money.
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My point is that you can't "focus" anything just interviewing 615 people. There are also more factors that weaken their results....
1) What state the people interviewed are from.
2) The population of the states they're from.
3) The percentages of who likes who in each state.
I could keep going down to county and city -lol. Now, a good poll would be to take one random person from each zip code or say 100 from each area code, but as you said, that would take too much time and money.