Remove class_survey from stat20data package#10

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wetchler wants to merge 1 commit intostat20:masterfrom

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Commits on Feb 3, 2026

Remove class_survey as 1. we don't use this version in class, we use a new csv from the current semester's survey, and 2. it creates a LOT of headaches for students who don't realize they are using…
wetchler
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