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 left-tailed test.
A) $- 1.645$
B) $\pm 1.645$
C) $\pm 1.96$
D) $- 1.96$

Question

Quizplus · Accepted Answer

For a left-tailed test with $\alpha = 0.05$, the critical z-value is $-1.645$. This value corresponds to the point where 5% of the data lies to the left in a standard normal distribution.

Assume That the Data Has a Normal Distribution and the Number