An experimental bumper was designed to reduce damage in low-speed collisions. This bumper was installed on an experimental group of vans in a large fleet, but not on a control group. At the end ofa trial period, there were 12 repair incidents (a "repair incident" is an accident that resulted in a repair invoice) for the experimental group and 9 repair incidents for the control group. The dollar cost per repair incident is shown below. 01d bumper: 1,874, 2,173, 2,182, 1,644, 2,464, 834. 1,085, 1,840, 1,086 New bumper: 549. 1,625, 2,065, 1,403, 1,348, 1,331. 884, 936, 2.219, 2,049, 1,900, 1,843 Click here forthe Excel Data File (a) Perform a two-tailed Mann-Whitney test at a = .05 and find the zstatistic and p-value. (Use the formulas in the textbook to determine the z-statistic and use Excel to calculate the p-value. If you use MegaStat to check your answers, you must use version 10.2 Release 2.1 or higher and do NOT correct for ties or continuity (leave boxes unchecked). Round your z-statistic to 3 decimal places and p-value to 4 decimal places.) z-statistic pvalue (b) Is there a difference in medians? No Yes (c) Perform a two-tailed parametric t test for two independent sample means and find the t statistic and the p-value. (Round your t answer to 2 decimal places and p-value to 4 decimal places.) p-valueCrash Damage for Fleet Vehicles Old Bumper New Bumper 1874 549 2173 1625 2182 2065 1644 1403 2464 1348 834 1331 1085 884 1840 936 1086 2219 2049 1900 1843