Manager doesn't think our non-anonymous survey data is biased

I work at a large firm but a relatively new data science team. The manager is apparently an experienced data scientist, or so I'm told.

I'm analyzing HR data of applicants to our company, specifically new graduates who have attended our seminars and partaken in surveys. The surveys are non-anonymous, their name and applicant ID, school, whatever, all visible. Questions like "Are you excited to work for us?" and questions related to benefits and salary are asked. This is obviously …

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