Which of the Following Threatens the Internal Validity of an Experiment

question 54

Multiple Choice

Which of the following threatens the internal validity of an experiment?

• A) Using more than one dependent variable
• B) Failing to use a representative sample
• C) Using an independent variable with more than one level
• D) Failing to assign participants randomly to conditions

---

Definitions:

Germinal Centers

Specialized sites within lymph nodes and spleen where mature B cells proliferate, differentiate, and mutate their antibody genes during an immune response.

Lymph Node

A small, bean-shaped structure that is part of the lymphatic system, playing a crucial role in filtering lymph and in the immune response by trapping pathogens and foreign particles.

Lymphocytes

A type of white blood cell that plays a crucial role in the body's immune response by recognizing and fighting pathogens.

Thymic Corpuscles

Small, spherical bodies found within the medulla of the thymus gland, involved in the maturation of T lymphocytes.