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    A 6th response option ("I don't know") added to a 5-point Likert scale. Is data lost?

    Hello, everyone, I need a little bit of help salvaging the data from a questionnaire. One of my colleagues applied a questionnaire, but inadvertently, instead of using the original 5-point Likert scale (strongly disagree to strongly agree), he inserted a 6th answer into the scale. And, to...