Employ a significance level of a=0.01 to test claim that µ > 2.85. The sample data comprises 9 scores for which (bar) X=3.1 and s=0.52.
A) z=2.896
B) t=2.896
C) z=1.44
D) t=1.44
Please show work. I know what the answer is but do not know how to get it.