Use the Wilcoxon matched-pairs signed rank test and = .05 to analyze the before-and-after measurements given.

Question:

Use the Wilcoxon matched-pairs signed rank test and α = .05 to analyze the before-and-after measurements given. Assume the underlying distributions are symmetrical.
Before ... After
49 .... 43
41 .... 29
47 .... 30
39 .... 38
53 .... 40
51 .... 43
51 .... 46
49 .... 40
38 .... 42
54 .... 50
46 .... 47
50 .... 47
44 .... 39
49 .... 49
45 .... 47