Answer
The students used different ranges of their y axes.
Step-by-step explanation
Jake concluded that the runoff resulted to minimum effects on the amount of dissolved oxygen levels where as Aisha concluded that the runoff had a bigger effect on dissolved oxygen amounts. The difference in their conclusions could be as a result of different interpretations they observed on the graph. The interpretations on the graph with similar x-axis properties could have differ due to use of different ranges for the y-axis leading to different shapes of the graphs