A Researcher Wished to Evaluate the Operating Life of a Certain

question 99

Short Answer

A researcher wished to evaluate the operating life of a certain brand of storage battery. A group of 30, brand-new batteries was selected and placed in 30 identical automobiles. The lights in each automobile were then turned on (without running the engines), and the length of time before the batteries were fully discharged (lights went out) was recorded. The scores, in hours, were: 15, 10, 20, 18, 18, 11, 11, 11, 11, 12, 12, 12, 10, 9, 9, 8, 9, 9, 11, 11, 11, 15, 12, 12, 12, 10, 12, 12, 15, 12.
-For the following set of scores, calculate the standard deviation:. 13, 14, 12, 15, 10, 7, 12

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Definitions:

Tet Offensive

A major military campaign during the Vietnam War in 1968, launched by North Vietnamese forces against South Vietnam, the United States, and their allies.

Hanoi

The capital city of Vietnam, known for its rich history, centuries-old architecture, and a mixture of Southeast Asian, Chinese, and French influences.

17th Parallel

A provisional military demarcation line between North and South Vietnam established by the Geneva Accords of 1954.

Counterinsurgency

A military, political, and social strategy employed to combat and defeat insurgency movements, often involving both military and civic actions to win the support of the local population.