Dr Guinea Was Studying the Relation Between the Amount of Caffeine

Multiple Choice

Dr. Guinea was studying the relation between the amount of caffeine intake and people's performance on a difficult task. He found out that as the amount of caffeine intake increases, the time to finish the task first decreases, and then increases. If he used the data to fit a linear regression model, which assumption would likely be violated?

A) Independence
B) Homogeneity
C) Linearity
D) Normality
E) Fixed X