A study is designed to evaluate theA study is designed to evaluate the effects of a new over-the-counter ointment for skin rash. Participants with skin rash are recruited for the study and asked to report the severity of their symptoms on a scale from 0-100 (0 = no symptoms of pain or itching to 100 = severe symptoms of pain and itching) before using the ointment and again after one week of treatment with the ointment. The best approach to quantify the effect of the ointment is: A confidence interval for the proportion of patients reporting no symptoms. of 9 B A confidence interval for the difference in proportions of patients reporting severe symptoms before and after treatment. C A two independent sample confidence interval for the difference in mean severity of symptoms before and after treatment. D A paired samples confidence interval for the mean difference in severity of symptoms before and after treatment. effects of a new over-the-counter ointment for skin rash. Participants with skin rash are recruited for the study and asked to report the severity of their symptoms on a scale from 0-100 (0 = no symptoms of pain or itching to 100 = severe symptoms