posted by kelly on .
Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, you’re improving! Or are you? On the first exam, the class mean was 71 with a standard deviation of 15. On the second exam the class mean was 95 with a standard deviation of 5. Convert your scores into z scores and determine whether your grade improved over the course of the semester relative to the other students in the class.