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

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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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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