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

Question

Quizplus · Accepted Answer

Correct C: In purposive sampling,the researcher handpicks cases based on the researcher's knowledge of the population (preterm infants).
Incorrect A: Quota sampling ensures proportional segments in the sample that mirror the population,but random sampling is not used.
Incorrect B: Random sampling ensures that all subjects have an equal chance of selection.
Incorrect D: Stratified sampling is similar to quota sampling except that random sampling is used.

In a Study to Determine Whether Placement on a Water