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An Engineer for an Electric Fencing Company Is Interested in the Mean

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An engineer for an electric fencing company is interested in the mean length of wires being cut automatically by machine.The desired length of the wires is 12 feet.It is known that the standard deviation in the cutting length is 0.15 feet.Suppose the engineer decided to estimate the mean length to within 0.025 with 99% confidence.What sample size would be needed?


Definitions:

Replacement-level Fertility

The fertility rate that maintains a population's size across generations, usually about 2.1 children per woman in most developed countries.

Average Replacement-level

The fertility rate at which a population exactly replaces itself from one generation to the next, without migration.

Actual Average

The true or exact mean calculated from a set of data, as opposed to an estimated or theoretical average.

Rhythm Method

A form of natural family planning based on tracking the menstrual cycle to predict fertile days to avoid or achieve pregnancy.

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