In a Study to Determine Whether Placement on a Water

question 28

Multiple Choice

In a study to determine whether placement on a water pillow affects head shape in preterm infants,the first 50 preterm infants admitted to a newborn intensive care unit during a specific year were assigned to either a usual-care group or a treatment group placed on water pillows.What type of sampling strategy is represented by this research plan?

• A) Quota
• B) Random
• C) Purposive
• D) Stratified

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Definitions:

Monopolistic Market

An economic scenario where only one seller provides a distinctive product or service, facing substantial obstacles that prevent other competitors from entering the market.

Purely Competitive Market

A market structure characterized by many buyers and sellers, free entry and exit, and products that are perfect substitutes.

Long Run

A period where all inputs or factors of production can be varied, allowing full adjustment to changes in the market or economy.

Short Run

A period in economics where at least one input is fixed and cannot be changed by the firm.