Describe Two Threats to Internal Validity That Are Particularly Problematic

question 5

Essay

Describe two threats to internal validity that are particularly problematic in longitudinal studies.

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Definitions:

Frame Misalignment

A condition where the structural frame of a vehicle is not correctly aligned, potentially affecting its performance and safety.

Wheel Alignment

The adjustment of the angles of wheels to each other and to the vehicle body to ensure proper tire wear and vehicle handling.

Axles

The rod or spindle (either fixed or rotating) passing through the center of a wheel or group of wheels.

Linehaul Truck

A type of truck specifically designed for the transportation of goods over long distances, often between cities or states.