Name the Three Threats to Internal Validity That Can Occur

question 8

Essay

Name the three threats to internal validity that can occur in studies regardless of the use of a comparison group. Why doesn't a comparison group help in these cases?

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Definitions:

Reaction

A reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

Complex Metal Hydrides

A class of compounds formed by the combination of a metal with hydrogen, typically used as hydrogen storage materials.

Ketones

Organic compounds characterized by the presence of a carbonyl group bonded to two carbon atoms.

Alcohols

Organic compounds containing a hydroxyl (-OH) group attached to a saturated carbon atom, and are widely used in industry and chemistry.