How did they get this answer for critical value I know how to get a critical value but I am not sure now how to do it when they added "when testing the claim that p = 1/2"....
how did they get the answer for critical value ?


It would be good if we could see the entire question, but if it is the Sign-Test, then it make sense to use p = 1/2 because it is either "yes" (assigned a plus) or a "no" (assigned a minus, hence the name of the test) But again, more information about the question would be useful
