4. Wilcoxon Signed-Ranks Test. A final researcher hopes to test whether pediatric patients express different levels of anxiety before a surgery when a parent is present or not present (scale from 0 to 20). She collected data from six patients, measuring each when a parent is present and when one is not. Can she statistically prove that the patients express different levels of anxiety?

Child	Parent Present	Parent Not Present
1	10	14
2	18	2
3	10	5
4	17	7
5	20	12
6	2	10

Step 1: In terms of the problem, state the Null Hypothesis & Alternative Hypothesis. 2 pts

Step 2: Critical Value = 1.645

Step 3: Compute the statistic (Remember to rank the anxiety levels in ascending order and run the statistics on the ranks.) 5 pts

Step 4: Decide to accept or reject the null 1 pts

Step 5: In terms of the problem, summarize the results