1. In a study of the performance of a new engine design, the weight of 22 aircrafts (in tons) and the top speed (in mph) were recorded. A regression line was generated and shown to be an appropriate description of the relationship. The results of the regression analysis are below.

Number of Courses| Employment Status| Total Job No Job Four 19 30 49 Three 27 25 52 TWO 37 12 49 Total 83 67 150Depend Variable: Top Speed Variable Coefficient s.e. of Coeff t-ratio prob Constant 11.6559 0.3153 37 $ 0.0001 Weight 3.47812 0.294 11.8 $ 0.0001 R squared = 87.5% R squared (adjusted) = 86.9% 5 = 0.6174 with 22 - 2 = 20 degrees of freedom