When Conducting a Research Study Using a Convenience Sample of All

When conducting a research study using a convenience sample of all second-grade students from two classrooms in a nearby school,the nurse researcher may increase the sample control by

A) assigning one classroom to the experimental group and the other classroom to the control group.
B) exposing all subjects to the treatment variable and then comparing the outcome data to pretreatment data.
C) randomly assigning students from both classrooms to either the experimental group or the control group.
D) using these subjects as treatment subjects and comparing outcomes to a group of subjects from a similar study.

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