Researchers Wish to Test the Effectiveness of a Drug Designed

Multiple Choice

Researchers wish to test the effectiveness of a drug designed to treat depression.Seven clinically depressed patients are given a standardized depression test before taking the drug and are evaluated 4 weeks later using the same test.It is known that the scores from this particular test are not normally distributed.The scores are shown here. ​ ​
Use a sign test to conclude whether the drug can be associated with a median decrease in depression level.Choose the correct p-value and conclusion.(Use α = 0.05.)

A) p = 0.5000; there appears to be no median decrease in depression.
B) p = 0.8125; there appears to be no median decrease in depression.
C) p = 0.1875; there appears to be no median decrease in depression.
D) p = 0.1875; there appears to be a median decrease in depression.