2. The article Exhaust Emissions from Four-Stroke Lawn Mower Engines (J. of the Air and Water Mgmnt.

Question:

2. The article “Exhaust Emissions from Four-Stroke Lawn Mower Engines” (J. of the Air and Water Mgmnt. Assoc., 1997: 945–952) reported data from a study in which both a baseline gasoline mixture and a reformulated gasoline were used. Consider the following observations on age (yr) and NOX emissions (g/kWh):

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