\f\fThe Vermont Cancer Society conducted a study to investigate the effect of smoking on lung capacity. The Society randomly sampled 36 pairs of identical twins where one twin is a \"heavy\" smoker and the other twin is a non-smoker. The lung capacities (in cc's) of each pair of twins are: Smoker Non-Smoker Smoker Non-Smoker Smoker Non-Smoker 234 238 274 267 213 220 226 280 244 231 2?4 2T9 294 301 209 214 208 204 260 263 201 204 227 236 304 313 224 224 198 201 238 236 286 288 290 296 282 290 232 222 240 242 26? 271 289 300 212 213 248 252 211 215 236 230 270 265 327 328 274 281 193 196 227 230 265 269 254 260 259 251 205 206 At the 0.05 level of signicance, test the hypothesis that the mean lung capacity of all smokers is less than the mean lung capacity of all non-smokers