Identifying the Causal Effects of a Policy by Looking at Two

question 27

Multiple Choice

Identifying the causal effects of a policy by looking at two samples that lie on either side of a threshold is called

• A) difference-in-differences.
• B) statistical significance.
• C) regression discontinuity.
• D) intention to treat.

---

Definitions:

Antibiotics

Medicinal substances used to treat bacterial infections by either killing bacteria directly or inhibiting their growth.

Chytrid

A group of mostly aquatic fungi that play a role in decomposing organic matter and can sometimes be harmful to amphibians.

Chitin

A long-chain polymer of N-acetylglucosamine, a derivative of glucose, forming a hard, protective exoskeleton in arthropods and cell walls of some fungi.

Wheat Rust

A disease caused by fungi that affects wheat crops, leading to significant yield losses.