A Researcher Does a Multiple-Baseline Study Across Individuals Looking at the Effect

Multiple Choice

A researcher does a multiple-baseline study across individuals looking at the effect of a 15-minute nap on first grade children's attention to academic work. Four children are included in the study. Below are graphs of the results. The dependent measure is the number of minutes the child is on task. Child 1 gets the treatment after 5 baseline sessions. Child 2 gets the treatment after 10 baseline sessions, Child 3 after 15, and Child 4 after 20. Overall, the nap:

A) Was effective in increasing time on task
B) Was ineffective in increasing time on task
C) Was unrelated to time on task
D) Might have had an effect but impossible to tell from the graph