Question: A consumer magazine wants to research the durability of different brands of golf balls. It randomly selects 7 golf balls from each of six brands. The balls are hit over and over, until they become unusable, up to 300 times. The number of hits before cracking/breaking (up to the maximum 300) is recorded for each golf ball. At α = 5%, is the average durability of golf balls the same for each brand?

BRAND / REPLICATE 1 2 3 4 5 6 7

DBM 300 300 300 260 300 261 300

GR 190 164 238 200 221 132 156

HL 228 300 268 280 300 300 300

RTP 276 296 62 300 230 175 211

STF 162 175 157 262 200 256 92

WPS 264 168 254 216 257 183 93