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your survey is inaccurate due to the unscientificness of your sample. you need to choose a sampling method (such as SRS sampling perhaps) that will insure the randomness and diversity of your sample results.
What you are doing now is refered to as a 'convenience sample'.
Anyway, just thought you should know...ugh all those hours of stats are rubbing off it seems
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"I believe in a long, prolonged, derrangement of the senses to attain the unknown" - Jim Morrison
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