A sporting goods manufacturer has developed a new type of golf ball that he is sure will travel further than any other type of ball currently in use. In an experiment, he took 10 of his golf balls to a local driving range, where he asked 10 golfers to hit the ball with a driver. The distances were measured, and recorded as follows: Golfer A B C D E F G H | J Distance (m) 230 190 227 241 208 228 258 260 181 227 At the 1% level of significance, can we conclude that the manufacturer's new golf ball travels on average more than 200 metres [You may assume that driving distances for the golf ball is normally distributed]