6.SP.A.1
A statistical question is one whose answers vary — "how tall are the students?", not "how tall am I?"
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The standard, officially
Recognize a statistical question as one that anticipates variability in the data related to the question and accounts for it in the answers. For example, “How old am I?” is not a statistical question, but “How old are the students in my school?” is a statistical question because one anticipates variability in students’ ages.