Suppose the class that received X 1 had consistently higher scores than the other two classes on the fourth, fifth and sixth exams. The class that received X 2 had a higher score on the fourth exam than the control class, but had about the same scores as the control class on the fifth and sixth exams. If all classes had very similar scores on the first three exams, this result is interpreted as:
a. there are no experimental treatment effects.
b. X1 has a persistent effect, but there are no other effects.
c. X1 has an immediate and a long-term effect; X2 only a lesser, immediate effect.
d. X1 and X2 have the same immediate effect, but only X1 has a persistent effect.
c
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