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Thirty students who failed the state writing exam were placed in a class in which they received additional tutoring. After completing the class, all 30 students retook the exam and earned higher scores. Their success was attributed to the effectiveness of class curriculum. Which source of internal invalidity has not been considered

Answer :

Baraq

The source of internal invalidity that has not been considered is "Statistical Regression."

This is because statistical regression as a source of internal invalidity suggests that when the initial study reveals a huge or low extent of the dependent variable, any change tends to show a different result, affecting the study conclusion.

In this case, the researcher can't be definite about the effectiveness of the class curriculum since all the thirty students that failed initially passed the second time.

Hence, in this case, it is concluded that the correct answer is Statistical regression.

Learn more here: https://brainly.com/question/22041088

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