A researcher observed that drinking coffee improved performance on complex math problems up to a point.The researcher also noted,however,that excessive coffee drinking actually interferes with problem solving.What type of relationship was observed?
A) Positive
B) Negative
C) Curvilinear
D) No relationship

Question

Quizplus · Accepted Answer

The observation of improved performance up to a point, followed by a decrease in performance when coffee consumption is excessive, suggests a curvilinear relationship between coffee consumption and problem-solving ability.

A Researcher Observed That Drinking Coffee Improved Performance on Complex