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Define internal validity in research design. Describe two threats to the internal validity of a research study. (Note: For each threat, be sure to label it, describe it, and be sure to indicate how it specifically is a threat to the internal validity of the design.)
C-Channel Frame Rail
A structural component in vehicles or machinery, shaped like the letter 'C', providing support and rigidity.
Flange
A flat rim, collar, or rib, typically projecting for strength or attachment to another object, as at the end of a pipe, steam cylinder, etc.
Gusset
A triangular piece of metal used to reinforce or strengthen a joint in structures or in components like bicycle frames.
Tempered Frame Rails
Tempered Frame Rails are treated through tempering, a heat treatment process to increase the toughness of steel used in the frame rails of vehicles, enhancing strength and durability.
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