To determine which model best fits the data presented in the graph titled "Time Spent and Test Grades," we consider the relationship between hours worked (x-axis) and grades (y-axis).
Since the question describes points plotted in quadrant 1 and suggests the relationship involves test grades improving with increased study hours, a linear model is likely appropriate. This is often seen in educational settings where more time studying generally leads to better grades, suggesting a straight-line relationship.
However, without seeing the actual points or the line plotted on the graph, we cannot definitively conclude. If the points are close to forming a straight line, then:
The best fit would be: a linear model.