In a multiple regression equation two independent varlables are considered, and the sample size is 25. The regression coefficients and the standard errors are as follows: b1 = 2.676 sb1 = 0.56 b2--0.880 sb2 =0.71 Conduct a test of hypothesis to determine whether either independent variable has a coefficient equal to zero. Would you Consider deleting either variable from the regression equation? Use the 0 05 significance level