State University Uses Thousands of Fluorescent Light Bulbs Each Year $\bar { x }$

question 71

Essay

State University uses thousands of fluorescent light bulbs each year. The brand of bulb it currently uses has a mean life of 800 hours. A competitor claims that its bulbs, which cost the same as the brand the university currently uses, have a mean life of more than 800 hours. The university has decided to purchase the new brand if, when tested, the evidence supports the manufacturer's claim at the .05 significance level. Suppose 121 bulbs were tested with the following results: $\bar { x }$ = 827.5 hours, s = 110 hours. Conduct the test using α = .05.

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Definitions:

Discomfort

Discomfort refers to a feeling of physical or mental unease, ranging from mild annoyance or pain to significant distress.

Urethra

The tube that conveys urine from the bladder to the exterior of the body in both males and females, and also serves as a passageway for semen in males.

Bladder

A muscular organ in the pelvis that holds urine until it is excreted.

Body

The physical structure of a person or an organism, including the bones, muscles, skin, and vital organs, encompassing both the visible external parts and internal components.