Explain briefly. Problem 3. According to the Commission of Higher Education, full-time graduate students receive an average salary of Php 12,800. The dean of graduate studies at a large state university in the country claims that his graduate students earn more than this. He surveys 46 randomly selected students and finds their average salary is Php 13,445 with a standard deviation of Php 1800. What specific statistical tool to use in order that the dean's claim is correct