When there is exclusive concern that the population mean differs from a value in a specified direction,we should use _____.
A)a nondirectional test
B)a directional test
C)a stringent á
D)both a and c above

Question

Quizplus · Accepted Answer

A directional test is appropriate when there is exclusive concern that the population mean differs from a value in a specified direction, such as being greater or less than the specified value. This type of test allows us to focus our analysis on the specific direction of interest and potentially increase the power of the test by ignoring the opposite direction. A stringent level of significance (i.e. a very low alpha level) can also be used to increase the confidence in the results. Therefore, the best choice is B) a directional test.

When There Is Exclusive Concern That the Population Mean Differs