A researcher defined a population and drew three samples from this population. Samples were taught by different methods for 12 weeks. Participants were then tested, and it was found that the three samples were not equal in ability. What could have caused this inequality?
A) The samples started out unequal in ability.
B) The methods were not equally effective.
C) All external variables were not controlled.
D) All of these are correct.
Correct Answer:
Verified
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