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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?
Matter
Anything that occupies space and has mass, composed of atoms or molecules and is the substance that makes up the physical universe.
States
Different forms in which matter can exist, typically observed as solid, liquid, gas, and plasma.
Solid
A state of matter characterized by particles that are closely packed together, resulting in a fixed volume and shape.
Liquid
A state of matter characterized by a definite volume but no fixed shape, conforming to the shape of its container.
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