Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.
-$\alpha = 0.05$ for a two-tailed test.
A) $\pm 2.575$
B) $\pm 1.96$
C) $\pm 1.645$
D) $\pm 1.764$

Question

Quizplus · Accepted Answer

For a two-tailed test with $\alpha = 0.05$, the critical z value is $\pm 1.96$. This is because the area in each tail is 0.025, and the z-score that corresponds to the cumulative area of 0.975 (or 0.025 from the upper end) is $\pm 1.96$.

Assume That the Data Has a Normal Distribution and the Number