Researchers did a study and say that "night owls" (late sleepers) have a better dream recall than "early birds" do.

100 people of each type was studied and recorded their dreams for one week.
Now, we have the mean, median, and SD of the # of dreams recalled during the week. We also have the proportion who had no dreams, or had 5 or more dreams.

Im supposed to come up with 3 different hypotheses that would work to test the researchers claim. So far I have 2. I cant figure out another one.

Ho: Mean(E)- Mean(N) = 0
Ha: Mean(E)- Mean(N) doesnt = 0
then the other one is...
Ho: P(E) - P(N) = 0
Ha: P(E) - P(N) doesnt = 0

Whats another one?