Which Is NOT an Example of an Observational Study

question 8

Multiple Choice

Which is NOT an example of an observational study?

• A)Researchers assign participants to teach either older or younger people how to use a computer to test whether participants appear more frustrated teaching older people.
• B)A manager uses sales records to compare the performance of different employees.
• C)A professor studies the relationship between democracy and per capita income using country-level data from the World Bank.
• D)A political scientist uses data from a random sample survey of 2000 US adults to examine the effect of media exposure on people's trust of government.

---

Definitions:

Bone Spur

A bony growth formed on normal bone, often due to aging or as a response to friction or pressure.

Fluid

A substance that has no fixed shape and yields easily to external pressure; can be a gas or a liquid.

Genu Valgum

A condition characterized by an inward curvature of the legs, commonly known as "knock-knees."

Knock Knees

A condition where the knees angle in and touch when the legs are straightened, often noticeable when standing.