Below you are given a partial computer output based on a sample of 16 observations. Coefficient Standard Error Constant 12.924 4.425 X -3.682 2.630 45.216 12.560 X2 Analysis of Variance Source of Degrees Sum of Mean Variation of Freedom Squares Square F Regression 4,853 2,426.5 Error 485.3 We want to test whether the parameter is significant. The test statistic equals Oa. -1.4 Ob. 1.4 c. 3.6 d. 5 Consider the following time series. t 1 Y 4 2 7 3 4 9 10 The slope of linear trend equation, b, is Oa. 2.5 Ob. 2.0 c. 1.0 Od. 1.25