Before using the survey as evidence in support of genetically modified ingredients in school cafeterias, the writer would need to determine:
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The methods used by the survey author to conduct the survey - This is important to assess the reliability and validity of the data collected.
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Whether the survey reflects the experiences of most people - Understanding the demographics and representativeness of the survey participants helps ensure that the results can be generalized to the broader population.
These two factors will help the writer judge the credibility and applicability of the survey results in their argument.