An experiment was made to measure the mean number of axe strikes that is necessary to cut a tree trunk. 16 identical tree trunks were cut by a randomly chosen person. Observation Number of strikes
1 52
2 54
3 49
4 55
5 44
6 47
7 53
8 45
9 46
9 48
10 55
11 44
12 51
13 54
14 56
15 52
Use the Wilcoxon signed-rank test to investigate the claim that the median number of strikes is 50.
Determine the sum of the positive ranks.
Determine the sum of the absolute values of negative ranks.
Determine the value of test statistic.