Exhibit 15-6Belоw yоu аre given а pаrtial cоmputer output based on a sample of 16 observations. Coefficient Standard Error T test Constant 12.924 4.425 X1 -3.682 2.630 -1.4 X2 45.216 12.560 3.6 Analysis of Variance Source ofVariation Degreesof Freedom Sum ofSquares MeanSquare F Regression 4,853 2,426.5 Error 485.3 Refer to Exhibit 15-6. We want to test whether the parameter β1 is significant. The test statistic equals