The sum was correct for the rows and wrong for the orders
My approval of a joined report let one order amount appear several times. The correction concerned the level of meaning, not an arithmetic failure or an actual customer charge.
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A useful number still needs the question it answers
The repairs still open were part of the waiting-time question
A four-day median described closed jobs while forty others had already waited ten days. Service evidence needed to preserve unfinished observations without inventing their eventual completion times.
Read the essaySix hundred visitors did not create six hundred randomised assignments
A shop-level pilot produced individual observations, but its inference needed to retain the group assignment. A large record count could not substitute for the experiment that actually occurred.
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