Find the critical value and rejection region for a left-tailed $z$-test where $\alpha =0.025$.

• A. Critical value: $z_c=-1.96$Rejection region: $z_{}>-1.96$
• B. Critical value: $z_c=-1.96$Rejection region:
• C. Critical value: $z_c=1.96$Rejection region:
• D. Critical value: $z_c=1.96$Rejection region: $z>1.96$

Answer: (B)