7.2-10. Twenty-four 9th- and 10th-grade high school girls\ were put on an ultraheavy rope-jumping program. The\ following data give the time difference for each girl\ (before program time minus after program time) for\ the 40-yard dash:\ 0.28 0.01 0.13 0.33 0.03 0.07 0.18 0.14\ 0.33 0.01 0.22 0.29 0.08 0.23 0.08 0.04\ 0.30 0.08 0.09 0.70 0.33 0.34 0.50 0.06\ (a) Give a point estimate of \\\\mu D, the mean of the difference in race times.\ (b) Find a one-sided 95% confidence interval that is a\ lower bound for \\\\mu D.\ (c) Does it look like the rope-jumping program was\ effective?