Dr. Tasuna is conducting a study to see if stories that have conflict in the plot cause fear in young children. Dr. Tasuna recruits 30 children to be in his study, and he has the parents of half of the children read them a story that has conflict in the plot. The other half of the children are read a book that summarizes different kinds of vehicles. Dr. Tasuna measures the heart rate of the children as an indication of fear. In this study, heart rate