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.

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) (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.
RELATED QUESTIONS
If a medical researcher wishes to determine whether there is evidence that the annual... (answered by stanbon)

If a researcher wishes to determine whether there is evidence that the mean family income (answered by stanbon)

If a statistician wishes to determine whether there is evidence that the average family... (answered by stanbon)

B. In a certain city, a researcher wishes to determine whether the average income of... (answered by Boreal)

According to an estimate, the mean income of attorneys was $66,272 in 2011. A researcher... (answered by ewatrrr)

If a sociologist wishes to determine if there is evidence that average family in a... (answered by stanbon)

1. The researcher claims that the mean IQ of statistics teachers is greater than 160. If... (answered by ewatrrr)

A researcher wishes to test the claim that the average cost of tuition and fees at AIT is (answered by Hamza Goher)

A medical researcher say that less than 25% of U.S. adults are smokers. In a random... (answered by Theo)