Do people walk faster in an airport when they are departing (getting on a plane) or after they have arrived (getting off a plane) ? An interested passenger watched a random sample of people departing and a random sample of people arriving and measured the walking speed (in feet per minute) of each. What type of study design is being performed?

Answer: This is an observational study

Explanation:

What is an observational study?

Observational studies are those studies in which a researcher will set their time apart to observe a particular action without interrupting it or changing it; they observe it as it is without introducing anything or reducing anything from it.

A researcher above is just watching how people walk from or to the airplane without him making any interventions.