In a(n) _____ problem,certain characteristics of a population are assumed known.We then answer questions concerning a sample from that population. 
Definitions:
Detonation
An uncontrolled, explosive ignition of fuel in an engine's cylinder, causing damage and reducing efficiency.
EGR System
An Exhaust Gas Recirculation System helps reduce nitrogen oxide emissions by recirculating a portion of an engine's exhaust gas back to the engine cylinders.
Air/Fuel Ratio
The ratio of air to fuel in an internal combustion engine, crucial for efficient performance and emissions control.
Scan Tool
A diagnostic tool used to interface with, diagnose, and sometimes reprogram vehicle control modules.
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