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Didn't dive into it in the post, but we settled the survey-entry-mistake hypothesis to our satisfaction by looking only at the responses that were gathered via phone (about 1/4 of the dataset) and finding that the same trends still held true.

Also, I really wanted the grade inflation hypothesis to be true, but I just took another look at the data and age turns out not to be consistently indicative of lower or higher grades for city services.

Thanks for the comment. Both really valid questions/comments.




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