Dr Welsh Is Doing Experiments Using Drugs

question 90

Essay

Dr. Welsh is doing experiments using drugs. He is concerned that his subjects will respond to demand characteristics. He may want to control for this by using which of the following?
a. stratification
b. two independent variables
c. a placebo
d. randomization

---

Definitions:

Net Primary Productivity

The rate at which plants and other photosynthetic organisms produce organic compounds in an ecosystem minus the rate of respiration.

Tropical Rain Forest

Biome found near the equator, characterized by warm weather, plentiful rainfall, high biodiversity, and mainly tree-living animal life.

Biomes

Large ecological areas on the earth's surface, with flora and fauna (animals and plants) adapted to their environment.

Biome

One of the biosphere’s major communities, characterized in particular by certain climatic conditions and particular types of plants.