Test H0: mu=42 versus HA: mu isn't equal to 42 when Xbar = 42.8, s=1.2 and n=16 at a=.01 and .05. Suppose that the population from which sample is selected is normally distributed. Indicate which test you're performing; show the test statistic and the critical values as well as mention whether the test is one-tailed or two-tailed.