For each of the following t values indicated whether the t is statistically important for a two-tailed test, at the specified alphas:
a. t = 2.40, df = 25, a = 0.01
b. t = 2.40, dr = 25, a = 0.05
c. t = 5.52, df = 10, a = 0.01
d. t = 2.02, df = 150, a = 0.05