In comparisons between control and experimental groups before and after program implementation, a major hindrance is(are)
A) the Hawthorne effect.
B) differences between jurisdictions.
C) positive biase.
D) ethical considerations.

Question

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The Answer of In comparisons between control and experimental groups before and after program implementation, a major hindrance is(are)
A) the Hawthorne effect.
B) differences between jurisdictions.
C) positive biase.
D) ethical considerations.

In Comparisons Between Control and Experimental Groups Before and After