In a Study to Determine Whether Placement on a Water

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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