The concentration of carbon monoxide in parts per million is believed to be normally distributed with a

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The concentration of carbon monoxide in parts per million is believed to be normally distributed with a standard deviation σ = 8.

A single measurement of the concentration is made, and its value is 85.

a. Use the methods of Section 8.1 to construct a 95%

confidence interval for the mean concentration.

b. Would it be possible to construct a confidence interval using the methods of this section if the population standard deviation were unknown? Explain.

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Elementary Statistics

ISBN: 9781259969454

3rd Edition

Authors: William Navidi, Barry Monk

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