A manuscript in a medical journal gives a 95% confidence interval for the mean difference in diastolic blood pressure (DBP) between a group of patients who have been given an experimental drug, denoted as group E, and the standard of care, denoted as group C, which was (-1.22, 13.46) mm Hg. The corresponding p-value was 0.12 and the difference in sample means was 6.12 mm Hg. Researchers in this area have reached a general consensus that reductions of at least 4 mm Hg in DBP in experimental drugs are required to be considered important. Which of the following is true?

Question options:

a. There is an 88% chance of rejecting the null hypothesis

b. The probability that we will say there is a difference, when there really is not, is less than 12%

c. The observed difference was statistically significant but not clinically significant

d. The observed difference was clinically significant but not statistically significant