The Understanding America Survey is an internet-based panel, but Center for Economic and Social Research researchers select the participants based on postal codes, so their initial invitation to participate is sent via snail mail, said Tania Gutsche, the center's managing director. Darling said that about ...
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The Understanding America Survey is an internet-based panel, but Center for Economic and Social Research researchers select the participants based on postal codes, so their initial invitation to participate is sent via snail mail, said Tania Gutsche, the center's managing director. Darling said that about ...
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