Records on a flEet of Trucks Reveal That the Average

question 71

Multiple Choice

Records on a fleet of trucks reveal that the average life of a set of spark plugs is normally
Distributed with a mean of 35,600 kilometres. A manufacturer of spark plugs claims that its plugs
Have an average life in excess of 35,600 kilometres. The fleet owner purchased 18 sets and found
That the sample average life was 37,700 kilometres, the sample standard deviation was 2415
Kilometres and the computed t = 3.677.

• A) Based on these findings, there is enough evidence to accept the manufacturer's claim at the 0.05 level.
• B) Based on these findings, there is NOT enough evidence to accept the manufacturer's claim at the 0.05 level.
• C) Based on these findings, there is enough evidence to accept the manufacturer's claim at the 0.05 level, but NOT at the 0.01 level.
• D) Based on these findings, there is NOT enough evidence to accept the manufacturer's claim at the 0.01 level.
• E) Based on these findings, there in NOT enough evidence to accept the manufacturer's claim at either the 0.05 or the 0.01 level.

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Definitions:

Cognitive Abilities

Mental skills that encompass learning, thinking, reasoning, problem-solving, decision-making, and memory.

Qualitatively Different

Describes phenomena or results that are distinct not merely in magnitude but in their fundamental nature or category.

Theory of Mind

The capacity to recognize and understand thoughts, feelings, desires, and intentions in oneself and others, while also grasping that others may hold beliefs, desires, and intentions that diverge from one's personal ones.

Egocentrism

The inability to understand or assume any perspective other than one's own.