A Researcher Wished to Evaluate the Operating Life of a Certain

question 23

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: 10, 8, 12, 3, 6, 7, 2, 10

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Definitions:

Liability

Obligations or debts that an entity owes to others, which must be settled through the transfer of assets or services.

Services Performed

Tasks or work completed, particularly in the context of professional or commercial services.

Depreciation Expense

An accounting method used to allocate the cost of a tangible asset over its useful life, representing how much of an asset's value has been used up over a period.

Accumulated Depreciation

The cumulative total of the depreciation expense allocated for a physical asset from the time it was first utilized.