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:

Negative Stereotype

A preconceived and oversimplified belief or idea about certain attributes or behaviors of a group that is generally unfavorable.

Group Differences

The variations or disparities that exist between different groups, such as cultural, socioeconomic, or demographic distinctions.

Performance

The act of carrying out or accomplishing an action, task, or function.

Stereotype Threat

The risk of conforming to stereotypes about one's social group, which can hinder performance and behavior.