There are two donors which have donated $5,000 (just enough to be mentioned), three which have donated $10,000, one which has donated $15,000, and one which has donated $25,000, which suggests “people like donating such that their total is a multiple of $5,000” as a strong competing hypothesis.
There are two donors which have donated $5,000 (just enough to be mentioned), three which have donated $10,000, one which has donated $15,000, and one which has donated $25,000, which suggests “people like donating such that their total is a multiple of $5,000” as a strong competing hypothesis.
Touche