A Researcher Conducts an A-B Design Study and Is Concerned

question 11

Multiple Choice

A researcher conducts an A-B design study and is concerned that there might be confounds in her study as a result of the passage of time. Which of the following threats to internal validity is NOT associated with the passage of time?

• A) Selection
• B) History
• C) Maturation
• D) Instrumentation

---

Definitions:

Vellus

Fine, light-colored, and barely noticeable hair that covers the majority of the body, different from terminal hair.

Sudoriferous Glands

Glands located under the skin that produce sweat as part of the body's cooling mechanism.

Eccrine

Referring to eccrine sweat glands, which are responsible for regulating body temperature through sweat secretion.

Apocrine

A type of gland that releases some of its cellular material along with its secretions, commonly found in areas like the underarms and pubic region.