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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Definitions:

Acetylcholine

A neurotransmitter important for learning, memory, and muscle movement.

Enzyme

A biological molecule that acts as a catalyst, speeding up chemical reactions in the body without being consumed or altered in the process.

Body Fluids

Liquids originating from inside the bodies of living organisms, which include blood, saliva, semen, and sweat, among others.

Central Nervous System

The primary information processing center of the body, consisting of the brain and spinal cord, responsible for processing and sending out signals.