A Researcher Studies the Effect Upon Dental Caries Formation of a Year-Long

A researcher studies the effect upon dental caries formation of a year-long regimen of daily rinsing with a particularly noxious-flavored oral solution, only to discover that 285 of the 300 subjects in the study have withdrawn from it by the end of the first month. Which step in the research process was not properly undertaken?

A) Defining the purpose
B) Conducting the literature review
C) Selecting study variables
D) Performing a pilot study

Correct Answer:

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