19. Suppose that the significant level of a statistical hypothesis test is $\alpha$. The null hypothesis will be rejected when:
(A) \( p \)-value \( \leq \alpha \)
(B) \( p \)-value \( >\alpha \)
(C) \( p \)-value \( \leq \alpha / 2 \)
(D) \( p \)-value \( >\alpha / 2 \)
(E) \( p \)-value \( = \frac{\alpha}{2} \)

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