The cholesterol levels of 100 students randomly selected at a university were measured at the beginning (x) and at the end (y) of a health dynamics...

The cholesterol levels of 100 students randomly selected at a university were measured at the beginning (x) and at the end (y) of a health dynamics course. The measurements show that x>y for 52 students, xy)=0.5 against an appropriate alternative hypothesis. Let alpha equal 0.05