To compare bumper guards, 6 of each kind were mounted on a certain kind of impact car. Then each car was run into a concrete wall at 6 miles per hour. The following are the cost of repairs (in $) Bumper 1 107 148 123 165 102 119 Bumper 2 134 115 112 151 133 129 Use alpha = 0.05 level of signicance to calculate the CI for the difference between the true means knowing that the variances are not equal. Lower: Upper: What can you conclude with these results