申論題

8. Is cigs statistically significant at the 5% level against a two-sided alternative? Construct the hypotheses test in detail. Note that prob(T > 1.96) = 0.025 and prob(T > 1.645) = 0.05, where prob(T >T t_c) is the area to the right of to in a t distribution with a large enough degrec of freedom.