1. As part of a fuel economy study, engineers wanted to compare the engine size (in liters) for automatic and manual transmissions. They randomly selected 15 cars for the two types of transmissions and recorded the engine size. a) To determine if there is a difference in the mean engine size, the researchers considered a two-sample t-test. Based on the output below, what are the test statistic and p-value?| 4t Test manual-automatic Assuming unequal variances Difference -0.8400 t Ratio -1.51152 Std Err Dif 0.5557 DF 25.86022 Upper CL Dif 0.3026 Prob > It| 0.1428 Lower CL Dif -1.9826 Prob > t 0.9286 Confidence 0.95 Prob