In a Study That Seeks to Evaluate the Effect Caffeine

question 52

Multiple Choice

In a study that seeks to evaluate the effect caffeine has on narcoleptics,40 narcoleptic patients are randomly selected to participate.Fifteen of the patients are given high doses of caffeine,15 are given moderate doses,and 10 are given low doses over a period of 30 days.The total amount of time they slept over the 30 days was recorded.This is BEST described as a(n) _____ study.

• A) voluntary
• B) observational
• C) dosage
• D) experimental

---

Definitions:

Dual-Coding Theory

A theory proposing that both visual imagery and verbal information are used to represent information, suggesting that information is stored in long-term memory in two distinct forms: auditory (verbal) codes and visual (imagery) codes.

Visualization

The process of creating mental images to represent information, aiding in understanding, learning, or problem-solving.

Nonsense Words

A set of letters or sounds forming words without any inherent meaning, often used in language and reading research.

Rhyming Words

Words that have the same ending sound, often used in poetry, songs, and language learning.