Randomized Controlled Trials Cannot

question 102

Multiple Choice

Randomized controlled trials cannot:

• A)evaluate the impact of all programs or policies on development.
• B)explain why a particular program succeeded.
• C)guarantee that a program proven effective one place can be duplicated in another or that its effectiveness won't change over time.
• D)All of these statements are true.

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Definitions:

Mediastinum

The central compartment of the thoracic cavity surrounded by loose connective tissue, containing the heart, esophagus, trachea, major blood vessels, and other structures.

Pleural Fluid

The thin layer of fluid between the two pleurae (the membranes surrounding the lungs and lining the chest cavity) that lubricates and facilitates lung movement during breathing.

Inspiratory Muscles

Muscles involved in inhalation, primarily the diaphragm and intercostal muscles, which expand the thoracic cavity.

Pleural Pressure

The pressure within the pleural cavity, which can influence lung expansion and contraction.