In: Statistics and Probability
Practitioners measured spiritual well-being (SWB) in a sample of 16 adults who were alcoholic before and following treatment for alcoholism.
| Change in SWB Following Treatment  | 
|
|---|---|
| 
 −3  | 
 +12  | 
| 
 −1  | 
 +9  | 
| 
 +11  | 
 −4  | 
| 
 −2  | 
 +7  | 
| 
 +10  | 
 +6  | 
| 
 +20  | 
 −5  | 
| 
 −8  | 
 +15  | 
| 
 +14  | 
 +13  | 
Use the normal approximation for the Wilcoxon signed-ranks T
test to analyze the data above. (Round your answer to two decimal
places.)
z =