Problem
Scenario
Does amount of caffeine affect memory? This study was conducted using 30 participants who report not regularly consuming caffeine. The researcher has those 30 participants complete a memory task on three separate days (counterbalanced among participants). All participants complete the memory task after having none, moderate, and high levels of caffeine. The memory task was quantified as number of items correctly recalled. Assume data meets all assumptions for a parametric test.
Task
Which is best describes the scenario?