The child's initial attempt at striking an object with either a bare hand or an implement is very similar to the

To meet the DSM-5 criteria for PTSD, an individual must not only experience a traumatic event, but he must also

a. exhibit the presence of one (or more) intrusion symptoms associated with that traumatic event. b. experience an inability to recall the event. c. suffer depression and substance abuse. d. maintain a belief that he was responsible for the event.

The administration of Midwest State University wants to know if arrangement of chairs affects student participation in classrooms

What would be a good operational definition of the dependent variable in an experiment designed to measure this relationship? a) class size: under 50 or over 50 b) number of students enrolled in each class c) chair arrangement: theater style or circular d) frequency with which students ask questions