Professor Abadi is evaluating the relationship between food intake and ability to quickly complete a timed task. He provides a buffet lunch to all study participants. They can eat as much or as little as they want. Their plates of food are photographed and weighed before and after eating to estimate caloric intake. Thirty minutes later, they are given a timed attention task in which they must complete a puzzle on a computer screen as quickly as they can.
The following graph shows the results of Professor Abadi’s study:
