A Test Is Made Of $H _ { 0 } : \mu = 54$

Multiple Choice

A test is made of $H _ { 0 } : \mu = 54$ versus $H _ { 1 } : \mu \neq 54$ . A sample of size $n = 73$ is drawn, and $\bar { x } = 57$ . The population standard deviation is $\sigma = 21$ . Compute the value of the test statistic $z$ .

A) 5.59
B) 0.89
C) 1.22
D) 0.14