6.14 A sample of three girls and five boys are given instructions on how to complete a certain task. Then they are asked to perform the task over and over until they complete it correctly. The numbers of repetitions necessary for correct completion are 1, 2, and 5 for the girls and 4, 8, 9, 10, and 12 for the boys. Find the P value for the alternative that on the average the girls learn the task faster than the boys, and find a confidence-

interval estimate for the difference u ¼ MY MX with a confidence coefficient at least equal to 0.85, using the median test.