The Changing Ecology of Swamps Has Been the Subject of Much

question 6

Multiple Choice

The changing ecology of swamps has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level. Suppose that the Ministry of the Environment makes 15 measurements in one area of the swamp, yielding a mean level of total phosphorus of 12.3 parts per billion (ppb) and a standard deviation of 5.4 ppb. The Ministry wants to test whether the data support the conclusion that the mean level is less than 15 ppb. Assume measurements are normally distributed.
-The appropriate test statistic to test the hypotheses is _____.

• A)7.50
• B)1.94
• C)3.88
• D)-7.50
• E)-1.94

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