In a Small-Overlap Front Crash Test, a Car Is Crashed

question 9

Multiple Choice

In a small-overlap front crash test, a car is crashed into a simulated telephone pole and the maximum intrusion of debris into the passenger compartment of a specific model of car is Measured. This intrusion is normally distributed with a standard deviation of 2.5 cm.
How many cars must be crashed to establish that a 98% confidence interval for the mean intrusion of Debris into the passenger compartment will have a margin of error of 0.3 cm?

• A) 49
• B) 376
• C) 1
• D) 20

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Definitions:

Shims

Gaskets or spacers of a specific thickness used for setting such things as endplay, preload, or tolerances. May be steel plate or fiber.

Worm Gear

A type of gear consisting of a worm (screw) that meshes with a gearwheel, used in mechanisms where large gear reductions are needed.

Preload

A predetermined force applied to a component, such as a bearing on assembly, usually with the objective of preventing unwanted (end) play in operation.

Endplay

The axial movement or float of a shaft or part within its housing, which can be critical for the proper functioning of mechanical systems.