Biology, 11.02.2020 23:53 cxttiemsp021

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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