You wish to test if there is a difference in the average time male and female students spend studying for a business statistics class. Construct the null hypothesis:
a) Mean signM-Mean signF>0
b) Mean signM-Mean signF=0
c) Mean signM-Meansign F=/0 (Don't know how to make that sign,,,sorry)
d) MeansignM-MeansignF<0