Which of the following is TRUE?
A) Random assignment of the test units to the experimental and control groups is the feature that distinguishes the after-only with control group design from the static group comparison.
B) One of the advantages of the after-only with control group is that there is no chance for an interactive testing effect.
C) The after-only with control group design is particularly vulnerable to selection bias, and where random assignment is not possible, it remains suspect.
D) The after-only with control group design is particularly susceptible to problems of experimental mortality.
E) They are all true.
Correct Answer:
Verified
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