A Test Is Made Of $H _ { 0 } : \mu = 55$

Multiple Choice

A test is made of $H _ { 0 } : \mu = 55$ versus $H _ { 1 } : \mu > 55 .$ A sample of size $n = 68$ is drawn, and $\bar { x } = 56$ . The population standard deviation is $\sigma = 27$ . Compute the value of the test statistic $z$ .

A) 1.59
B) 0.04
C) 0.62
D) 0.31