A 2012 Gallup Survey Interviewed by Phone a Random Sample

Multiple Choice

A 2012 Gallup survey interviewed by phone a random sample of 474,195 U.S. adults. Participants were asked to describe their work status and to report their height and weight (to determine obesity based on a body mass index greater than 30) . Gallup found 24.9% obese individuals among those interviewed who were employed (full-time or part-time by choice) , compared with 28.6% obese individuals among those interviewed who were unemployed and looking for work.
What can you reasonably conclude from this survey?

A) The study used a voluntary response sample, so the results tell us nothing beyond what these participants answered.
B) The sample is too large for statistical significance.
C) Approximately 24.9% of American adults who are employed are obese compared with approximately 28.6% among those who are unemployed and looking for work.
D) Among American adults who read Gallup surveys, 24.9% of those who are employed are obese, compared with 28.6% of those who are unemployed and looking for work.