A Manufacturer Claims That the Mean Lifetime of Its Lithium

question 39

Essay

A manufacturer claims that the mean lifetime of its lithium batteries is 1400 hours. A homeowner selects 25 ofthese batteries and finds the mean lifetime to be 1380 hours with a standard deviation of 80 hours. Test themanufacturerʹs claim. Use α = 0.05. Round the test statistic to the nearest thousandth.

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Definitions:

World Community

A term referring to the international aggregation of nations and peoples, often used to highlight global cooperation and interdependence.

Cold War

A period of geopolitical tension between the Soviet Union and the United States, along with their respective allies, from the end of World War II in 1945 until the dissolution of the Soviet Union in 1991, characterized by propaganda, espionage, and proxy wars but avoiding direct military conflict.

Iran-Contra Scandal

A political scandal in the United States during the 1980s involving the clandestine sale of weapons to Iran to fund Contra rebels in Nicaragua, contrary to U.S. law.

Abroad

In a country other than one's own; experiencing or traveling to foreign countries.