I can't remember what it's called (Edit: Lizardman's Constant) but around 4 to 20% of people will give nonsense replies to any survey.
Like if you asked Are you Human? 4% (or more) of people will reply "No" just for fun, or because they don't read.
So you can try to adjust for this by asking a silly question, and if they reply that way ignore their entire survey, but that could lead to issues where they reply correctly on most of it, but false on the "fun" question.
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I can't remember what it's called (Edit: Lizardman's Constant) but around 4 to 20% of people will give nonsense replies to any survey.
Like if you asked Are you Human? 4% (or more) of people will reply "No" just for fun, or because they don't read.
So you can try to adjust for this by asking a silly question, and if they reply that way ignore their entire survey, but that could lead to issues where they reply correctly on most of it, but false on the "fun" question.