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Researchers want to know if the concentration of ammonia in the James River is above the...

Researchers want to know if the concentration of ammonia in the James River is above the safe level for consumption. They take samples and develop a data set. Their null hypothesis is that the sample mean is > 6(unsafe) and their alternative hypothesis is that the sample mean is < 6. Which of the following should they use in testing their hypothesis?

A) a one-tailed test

B) a two-tailed test

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Answer #1

Answer A) a one-tailed test e have not predicted the direction. It is used in research to verifv the null hypothesis.

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