An implementer threat to internal validity in a study comparing two methods is best controlled by:
A) allowing teachers to select the method they will use
B) insisting that each teacher use the assigned method
C) making sure that all teachers are equal in ability
D) using many teachers with each method

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The Answer of An implementer threat to internal validity in a study comparing two methods is best controlled by:
A) allowing teachers to select the method they will use
B) insisting that each teacher use the assigned method
C) making sure that all teachers are equal in ability
D) using many teachers with each method

An Implementer Threat to Internal Validity in a Study Comparing