Which of the following situations illustrates control over an external confounding variable?
A) Using a script to relay information about the study.
B) Randomizing assignment to control treatment groups.
C) Allowing for maximum flexibility over where data is collected.
D) Choosing a heterogeneous sample of subjects.
A
Feedback:
Use of a script to relay information about the study illustrates control over an external confounding variable-study context. Randomizing assignment to control the treatment groups, allowing for maximum flexibility over where data is collected, or choosing a heterogeneous sample of subjects does not illustrate control over an external confounding variable but pertain rather to those intrinsic to study participants.
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