Test the Claim That $\mu > 18 ,$ Given That $\sigma = 1.2 , \alpha = 0.05$

Essay

Test the claim that $\mu > 18 ,$ given that , $\sigma = 1.2 , \alpha = 0.05$ and the sample statistics are n = $50 \text { and } \bar { x } = 18.3 \text {. }$