Tell whether each statement are negatively correlated, positively correlated or zero/no correlation and explain why. 1. In May of last year, the number of classes Marty missed rose from 35 to 50. When grades were reported in June, Marty's grades had dropped from A's and B's to D's and F's.

2. Elizabeth increased her practice time for the mile run from five days a week to seven days a week. After
practicing, her time improved.

3. A scientist wanted to conduct a study that showed the relationship between a person's performance on a facial recognition test and a person's height. He had a
hard time conducting this experiment and showing a
relationship.

4.Dillon studied very hard for his marine bio exam. His grades went up.