In a study of aggression in children, a researcher has his undergraduate research assistants watch a group of children on the playground, and record the number of instances of physical or verbal attacks. Which category of measured variable is this researcher using? a) self-report measures

b) observational measures

c) physiological measures

d) neuropsychological measures

B. observational measures

Explanation:

When using observational measures as a variable, the researchers will not interfere directly to the subjects of the study. They will watch from the side and quietly observe the interaction between variables while they naturally occurred.

This can be seen on the experiment above.

The researchers do not told the children to attack each other, or intervene when it hapepned. They just silently observe and record the data