A Researcher Wished to Evaluate the Operating Life of a Certain

question 48

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: 5, 10, 10, 5, 5, 2, 3, 5, 9, 7.

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Definitions:

Depository Institution

A financial institution that accepts deposits from individuals and provides loan services.

Investment Bank

A financial institution that provides advisory services, financing, and investment services to individuals, corporations, and governments.

Short-term Debt Securities

Financial instruments that represent borrowed funds which must be repaid within a short time frame, typically less than one year.

Money Markets

Financial markets for short-term borrowing and lending, dealing with assets that have high liquidity and short maturities.