A Manufacturer Claims That the Mean Lifetime of Its Fluorescent $\alpha$

question 25

Essay

A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 25
bulbs and finds the mean lifetime to be 980 hours with a standard deviation of 80 hours. If α $\alpha$ = 0.05, test the
manufacturerʹs claim using confidence intervals.

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Definitions:

Mode of Transportation

The means by which people or goods are moved from one place to another, such as by car, train, bicycle, or airplane.

Hypothesis

An assumption or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

Ferris State University

A public university located in Big Rapids, Michigan, known for its comprehensive educational programs.

Chi-Square Distributions

A statistical distribution that is used to assess how likely it is that an observed distribution is due to chance, especially useful for categorical data.