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14 1 point Identify a potential source of bias (if any). Using random digit dialing, 1599 people were called and asked what obstacles (such
14 1 point Identify a potential 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!) No source of bias. Maybe they don't have children. Not asking enough people. Using the word "obstacles". -11
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