What is the value for 
for a 95% confidence interval when n = 18?
Definitions:
Oil Pressure
A measure of the force per unit area exerted by oil circulating in the lubrication system of an engine.
Engine Repairs
Refers to the diagnosis and fixing of problems within an engine to restore its proper operating condition.
Valve Lash Adjustment
The process of setting the clearance between the valves and their respective lifters in an engine to ensure proper operation.
TDC Compression
Top Dead Center on the compression stroke; the point at which a piston is closest to the cylinder head, just before fuel ignition.
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