A university administrator obtains a report of the academic records of past scholarship athletes at the university. From the report, the administrator believes that the mean GPA (grade point average) of current male scholarship athletes is 3.02. If a researcher believes that the mean GPA of male athletes is significantly different than 3.02, what type of test should be conducted?
a) One-sided upper-tailed test
b) One-sided lower-tailed test
c) Two-sided test
d) Confidence interval