12.12 One of the selling points of golf balls is their durability. An independent testing laboratory is commissioned to compare the durability of three different brands of golf balls. Balls of each type will be put into a machine that hits the balls with the same force that a golfer uses on the course.

The number of hits required until the outer covering cracks is recorded for each ball, with the results given the table below. Ten balls from each manufacturer are randomly selected for testing.

Is there evidence that the mean durabilities of the three brands differ? Use = 0.05.

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Brand A B C 310 261 233 235 219 289 279 263 301 306 247 264 237 288 273 284 197 208 259 207 245 273 221 271 219 244 298 301 228 276