Six survey participants were asked to rate two brands (A & B) of coffee through a taste test. The rating scale is a composite score ranging from 1 to 28 (28 = extremely pleasing). The composite score is derived from individual ratings of characteristics like taste, aroma, richness, and acidity. The results are shown below: Participant Brand A Brand B 1 26 2 5 6 24 27 24 24 26 26 27 22 27 25 27 A hypothesis test is conducted using a 5% significance level to determine whether there is a preference for Brand B. What is the standard deviation of differences between the paired observations? Express your solution rounded to three decimal places. Your Answer: