n = 49; sample mean = 54.8; $\sigma$ = 28
H$_0$: $\mu$ = 50; H$_a$: $\mu \neq$ 50
a. Compute the test statistic. 1.2
b. What's the rejection rule? Reject H$_0$ if $|z| > z_{\alpha/2}$
c. At the .05 level of significance, your Critical Value is 1.96
d. If the test is done at a 5% level of significance, the null hypothesis should be reject