When a Researcher Asks the Question, "Have Subjects Been Pre-Selected

question 59

Multiple Choice

When a researcher asks the question, "Have subjects been pre-selected so as to represent the extremes on the variable of interest?" she is concerned with which one of the following potential threats to internal validity?

• A) testing effect
• B) maturation
• C) subject selection
• D) regression effect

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Definitions:

Cognitive Impairment

A reduction in cognitive functions such as memory, attention, and decision-making, which can affect daily activities.

Cholinesterase Inhibitor

A medication that blocks the breakdown of neurotransmitters, enhancing communication between nerve cells, often used in treating Alzheimer's disease.

Bisphosphonate

A class of drugs that prevent the loss of bone density, used to treat osteoporosis and similar diseases.

Beta-Blocker

A class of medications that are primarily used to manage abnormal heart rhythms and to protect the heart from a second heart attack.