1. A college student earned a score of 79 on a history exam and a score of 81 on a math exam. The overall results on the history exam had a mean of 70 and a standard deviation of 8 while the overall results for the math exam had a mean of 68 and a standard deviation of 12. Use z-scores to determine which exam score is relatively higher.

2. Suppose your statistics instructor reports test grades as z-scores, and you got a score of ?1.5 on an exam. Make a sentence explaining what that means.

3. Psychology experiments sometimes involve testing the ability of rats to navigate mazes. The mazes are classified according to di?iculty, as measured by the mean length of time it takes rats to find the food at the end. The time in seconds it takes several rats to finish a maze are shown below.