For the given $n$, critical values for the signed ranks test are tabled corresponding to the upper one-sided and two-sided significance levels in the column headings.
Table 1: Critical values for the signed ranks test.
  One-sided $\alpha$
  .05 .025 .01 .005
  Two-sided $\alpha$
  .10 .05 .02 .01
$n$        
5 1 -- -- --
6 2 1 -- --
7 4 2 0 --
8 6 4 2 0
9 8 6 3 2
10 11 8 5 3
11 14 11 7 5
12 17 14 10 7
13 21 17 13 10
14 26 21 16 13
15 30 25 20 16
16 36 30 24 19
17 41 35 28 23
18 47 40 33 28
19 54 46 38 32
20 60 52 43 37
21 68 59 49 43
22 75 66 56 49
23 83 73 62 55
24 92 81 69 61
25 101 90 77 68
26 110 98 85 76
27 120 107 93 84
28 130 117 102 92
29 141 127 111 100
30 152 137 120 109
31 163 148 130 118
32 175 159 141 128
33 188 171 151 138
34 201 183 162 149
35 214 195 174 160
36 228 208 186 171
37 242 222 198 183
38 256 235 211 195
39 271 250 224 208
40 287 264 238 221
41 303 279 252 234
42 319 295 267 248
43 336 311 281 262
44 353 327 297 277
45 371 344 313 292
46 389 361 329 307
47 408 379 345 323
48 427 397 362 339
49 446 415 380 356
50 466 434 398 373