Under a two-tailed hypothesis test with significance level , what is the critical z-value threshold for rejecting the null hypothesis?
Answer and explanation
Correct answer: B.
- Step 1: In a two-tailed test with , each tail contains of the probability. Step 2. The standard normal percentile corresponding to cumulative probability is . Hence is rejected when . **Answer: . Why not the others:** is the critical value for a one-tailed test at ; is for .
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