I need some help on answering this question . I am using Microsoft Excel and Word to answer it too. Thanks you ! ^_^

In a design study for a device to generate electricity from wave power at sea, experiments were carried out on scale models in a wave tank to establish how the choice of mooring method for the system affected the bending stress produced in part of the device. The wave tank could simulate a wide range of sea states (rough, calm, moderate, etc.) and the model system was subjected to the same sample of sea states with each of two mooring methods, one of which was considerably cheaper than the other. The resulting data giving root mean square bending moment in Newton meters are shown in Table below. Table : Wave Energy Device Mooring Data Sea State Method I Method ll SOOODAWN 2.23 1.82 2.55 2.42 7.99 8.26 4.09 3.46 9.62 9.77 1.59 1.40 8.98 8.88 0.82 0.87 10.83 11.20 1.54 1.33 11 10.75 10.32 12 5.79 5.87 13 5.91 6.44 14 5.79 5.87 15 5.50 5.30 16 9.96 9.82 17 1.92 1.69 18 7.38 7.41 (a) Find a 98% confidence interval for the mean difference in the bending stress of the two methods of mooring. (b) Test whether there is a difference in the mean bending stress of the two methods of mooring. Use 0.05 significance level. (14)