a consumer group is investigating apple's claim that the latest ipad has a 10-hour battery life. after running a random sample of 15 of the latest ipads under identical conditions, the group finds a 99% confidence interval for the mean battery life of this ipad to be (8.45, 10.05) hours. assuming battery life of this ipad is approximately normally distributed, does this confidence interval provide evidence that this ipad does not have an average battery life of 10 hours?