Please help me to understand this problem:

The overall distance traveled by a golf ball is tested by hitting the ball with Iron Byron, a mechanical golfer with a swing that is said to emulate the legendary champion, Byron Nelson. Ten randomly selected balls of two brands are tested and the overall distance measured. Assume the data are normally distributed. The data follow: Brand 1 Brand 2 259 292 276 248 287 271 260 265 283 271 273 281 279 275 271 270 263 267 263 268 (a) Is there evidence to show that there is a difference in the variance of the brands? Use O = 0.05. No. v (b) Calculate a 95% two-sided confidence interval on O 1 / 02. Round your answer to three decimal places (e.g. 98.765). 0.423 6.855