Positive differences 1+5+7+8+9 = 30

Negative differences  6+4+3+2 = 15

Two differences = 0

T=15

From the table of critical values for Wilcoxon signed rank test for one sample, with sample size of 11 – 2, 0 differences, n = 9, the first column show the range from 10 – 35 (T=15 is between the range) and correspond to p=0.2.

To obtain confidence interval, n=11, in the table, we search 11 sample size and the 95% confidence interval is between ranking 2 and 10.