=+7.41 ● In a study of warp breakage during the weaving of fabric (Technometrics [1982]: 59–65), 100 pieces of yarn were tested. The number of cycles of strain to breakage was recorded for each yarn sample. The resulting data are given in the following table:

86 146 251 653 98 249 400 292 131 176 76 264 15 364 195 262 88 264 42 321 180 198 38 20 61 121 282 180 325 250 196 90 229 166 38 337 341 40 40 135 597 246 211 180 93 571 124 279 81 186 497 182 423 185 338 290 398 71 246 185 188 568 55 244 20 284 93 396 203 829 239 236 277 143 198 264 105 203 124 137 135 169 157 224 65 315 229 55 286 350 193 175 220 149 151 353 400 61 194 188