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The Survey Research Methods
The Workplace Bullying Institute wrote the questionnaire items. Zogby International then conducted online interviews of 7,740 adults. A sampling of Zogby International's online panel, which is representative of the adult population of the U.S., was invited to participate. The online poll ran from 8/10/07 through 8/13/07. The margin of error (MOE) is +/- 1.1 percentage points. Margins of error are higher in sub- groups. Slight weights were added to region, party, age, race, religion, and gender to more accurately reflect the population.
You can read the detailed research sample demographics here.