SOLUTION: If a researcher wishes to determine whether there is evidence that the mean family income in the U.S. is greater than $30,000 then: A. a two-tailed test should be utilized.

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Question 374112: If a researcher wishes to determine whether there is evidence that the mean family income in the U.S. is greater than $30,000 then:
A. a two-tailed test should be utilized.
B. either a one-tailed or a two-tailed test could be used since they are equivalent.
C. a one-tailed test should be utilized
D. none of the above.

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
When you see key words like "greater than " or "less than ", this means that only one rejection region will be present. This region will be in either tail of the distribution. So a one-tailed test is needed.


So the answer is C)


Note: choice B is not true as the two tests are actually quite different.