In a study on attention and performance of memory tasks, six participants attended a 1-hour lecture on

Question:

In a study on attention and performance of memory tasks, six participants attended a 1-hour lecture on a topic chosen at random. Following this lecture, they received a survey testing their knowledge of the topics covered. After each 15 minute interval of the lecture, participants were asked 10 questions concerning facts covered. The table lists the number of incorrect answers recorded in each interval in this hypothetical study.