y=-499.166 + 61.780 (x1) + -5.554 (x2) + -29.431 (x3) + 28.443 (x4) + 22.143 (x5)

Say I am told to construct 95% confidence intervals. Would the alpha for my critical t be 0.05/(2*6) or would it be something else? To elaborate, for x1, would the confidence interval be

[61.780-(t0.0042, df)*Error, 61.780+(t0.0042, df)*Error]

or no?