The Main Internal Validity Problem of the Static-Group Comparison Design

question 42

Multiple Choice

The main internal validity problem of the static-group comparison design is

• A) observed posttest differences may be due to preexperimental differences between the groups rather than to the experimental treatment.
• B) the interaction between the experimental and control treatments.
• C) the pretest may sensitize subjects to the experimental treatment.
• D) the matching procedure may result in the loss of too many subjects and thus introduce bias.

---

Definitions:

Barium Swallow

A diagnostic imaging test that involves swallowing barium sulfate to coat the inside of the esophagus, stomach, and small intestine to be visible on X-ray.

Contrast Agent

A substance used in medical imaging to enhance the visibility of internal structures in radiographic procedures.

Retrograde Pyelogram

A type of X-ray examination of the urinary system that involves injecting a contrast agent to view the ureters, bladder, and kidneys.

Urinary Tract

The system in the human body consisting of the kidneys, ureters, bladder, and urethra involved in the production and excretion of urine.