Assume That the Data Has a Normal Distribution and the Number

Multiple Choice

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) $- 1.96$