Officials at The University believe that a new method of teaching business analytics will improve the grades of the students.They have selected a class of 30 students to be taught according to this new method.At the end of the semester, the average grade of these students was 78.Assume that the mean () grade across all of the business analytics classes that do not utilize this new method is 72with a standard deviation of 10.

What would be the proper set of hypotheses?

a) H0: = 78Ha: < 78

b) H0: = 78Ha: > 78

c) H0: = 72Ha: > 72

d) H0: = 72Ha: < 72