Information collected at a local university indicates that business majors enroll for an average (µ) of 10.65 credit hours per semester. As the Dean of the School of Communication, you are interested in how journalism majors compare. Taking a sample of enrollment records on 31 journalism majors, you find a mean (X) credit hour enrollment of 12.22 hours, with a standard deviation (s) of 3.26. Assume that you're working at the .05 level of significance.
a. State an appropriate null hypothesis.
b. What is the value of the calculated test statistic (t)?
c. Identify the critical value.
d. State your conclusion.