> Otoh if your interview questions are all 9 or 10 in difficulty most of your candidate will fail them and you'll have no data for a decision because all 8s wil

> Otoh if your interview questions are all 9 or 10 in difficulty most of your candidate will fail them and you'll have no data for a decision because all 8s will fail to answer in the same way as 6s and 3s Besides, it's a waste of their time and yours to have someone attempt a 9 or 10 before they show they can pass a 1.