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potent source of bias (if any). Using random digit dialing, 1599 people were called and asked what obstacles (such as childcare) kept them from
potent source of bias (if any). Using random digit dialing, 1599 people were called and asked what obstacles (such as childcare) kept them from exercising. (Source: Yankelovich Partners, Inc. for Shape Up America!) Not asking enough people. Maybe they don't have children. No source of bias. Using the word "obstacles".
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