A scientist decides to see how many cars use the far parking lot in the early morning. He sits inside where he can see the parking lot and counts cars. Which type of research is he using?

naturalistic-observation    

Explanation:

The scientist is using naturalistic-observation in his/her study. naturalistic-observation is a research technique that involves watching or studying the research subjects in their natural environment or state.  Watching the cars and the parking lot is a naturalistic-observation since the subjects are unaware of the study, they will behave normally as they would in their natural state. Results from this type of research is highly representative of the behaviours of the subjects of the study.

answer; formal diagnosis (vera wand formal dress);