I need help in this mcq.  A company claims that its new viral vaccine is 90% effective in preventing a contagious viral disease. Suppose that in a clinical trial with 3000 respondents, 2640 did not get infected by this disease. At 1% level of significance, what is the critical region? Solve and choose the best answer among the options a)z <-2.58 b)z > 1.96 c)z > 2.58 d)z < -1.96

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