A supervisor in the local factory feels that productivity during overtime is lower than productivity during normal working time. In order to verify his belief, he collected data on productivity per hour during both normal time and overtime. The productivity rates, in units per hour, are recorded in the table.

Do a 5 percent test to determine whether normal-time productivity is higher than overtime productivity.

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249 252 261 263 270 Overtime 253 254 262 268 271 257 256 265 269 272 250 260 264 273 278 Normal time 251 259 266 274 277 255 258 267 275 276