The standardized test statistic for a test of H₀: p = 0.4 versus H_a: p ≠ 0.4 is z = 2.43. This test is

a. not significant at either α = 0.05 or α = 0.01.

b. significant at α = 0.05, but not at α = 0.01.

c. significant at α = 0.01, but not at α = 0.05.

d. significant at both α = 0.05 and α = 0.01.

e. inconclusive because we don’t know the value of p̂.

Select the best answer.