An article reported the results of a study comparing the proportion still experiencing pain using a new medication (p1) compared to an older medication (p2). The expectation of the study was that the proportion still experiencing pain would be lower with the new medication.

The study showed that the proportion still experiencing pain was lower for the new medication (p1) when compared to the old medication (p2). The researcher is quoted as saying that there was less than a 5 in 100 probability that the observed differences in proportions was due to chance. The null hypothesis for this study is:

A. Ho: mu1 - mu2 = 0

B. Ho: P1 - P2 NE 0

C.

Ho: P1 - P2 > 0

D.

Ho: P1 - P2 = 0