19) When using the sign test to determine if the median age of FIU students is less than 25, we are unable to reject the null hypothesis that it is greater than or equal to 25. Fearing criticism, the researchers are concerned that perhaps they should have chosen a more powerful test. Is this a valid concern, why or why not?

A) no, the sign test is perfectly powerful enough for this situation.
B) no, the test did it's job there is no need for another more powerful test.
C) yes, because we were unable to reject the null and the sign test is not a powerful test.
D) yes, it is a poor test that should only be used as a last resort.