A Researcher Wished to Evaluate the Operating Life of a Certain

question 73

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 mean, range and standard deviation: 12, 2, 5, 9, 11, 10, 10, 4.

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Definitions:

Operate

To control the functioning of a machine, process, or system.

Decreasing-Cost Industry

An industry where input costs tend to fall as the industry as a whole expands its output.

LRAC Curve

The Long Run Average Cost curve shows the lowest possible average cost of production at different levels of output when all inputs are variable.

Entry

The act or process of entering into a market as a new supplier or producer, often facing barriers such as high startup costs or regulations.