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Result:1).H0: β = 0 H1: β < 0  ORH0: β eq 0 H1: β lt 0  2).This is lower tail testDf= 15-2=13Critical t= -1.7713).Se of b = sqrt( se/ssx) = sqrt(248.70^2/65758.0) =0.9698 t = \frac { \beta} { se}t = -6.153/0.9698 = -6.34464).YesNull hypothesis is rejected.Calculated t= -6.3446 is less than critical t value -1.7715).Yes.( the regression coefficient  is negative)  ...