The daily dissolved oxygen concentration for a water stream


The daily dissolved oxygen concentration for a water stream has been recorded over 30 days. If the sample average of the 30 values is 2.5 mg/liter and the sample standard deviation is 2.12 mg/liter, determine a value which, with 90 percent confidence, exceeds the mean daily concentration.

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Finance Basics: The daily dissolved oxygen concentration for a water stream
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