State University Uses Thousands of Fluorescent Light Bulbs Each Year $.05$

question 39

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: $\bar { x } = 830$ hours, $s = 110$ hours. Conduct the test using $\alpha = .05$ .

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Definitions:

Erikson's Psychosocial Development

A theory that describes eight stages through which a healthily developing human should pass from infancy to late adulthood.

Generativity Versus Stagnation

Erikson’s seventh stage of psychosocial development, in which the life crisis is the dichotomy between generativity (as in rearing children or contributing to society) and stagnation (a state characterized by lack of development, growth, or advancement).

Aging Parents

Refers to the phase of life where parents become elderly, often leading to reversals in caregiving roles where children may need to care for their parents.

Middle-Aged Daughter

A female individual in the middle stages of adulthood, commonly defined as between the ages of 40 and 65, who is a daughter to her parents.