After They Had Failed the Writing Exam That Was Required

After they had failed the writing exam that was required of all students before graduation, fifteen students were placed in a class in which they received additional tutoring. After completing this class, all fifteen students retook the exam earned higher scores. Their success was held up as an example that the class curriculum really works. What source of internal invalidity has not been considered?

A) History Effect
B) Noncomparable Groups
C) Contamination
D) Regression
E) Placebo Effect

Correct Answer:

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