It was brought to my attention that there was an error in the key I handed out for the practice midterm. Due to what was essentially a typo, I had the arrow in the tree in (3) starting in the wrong place. The labels were right, but it could still have been confusing. I’ve posted version 1.1 of the key on the schedule, or you can get it by clicking here: S14 practice midterm key v1.1.