What does it mean to say that the study does not have a lot of power to test a hypothesis? a. there are not enough people, too much variance or there is not a big difference between the two group means b. There a lot of people, very small variance, and small difference in the two group means c. there are not enough people, too much variance and a very big difference between the means d. there are a lot of people, too much variance or the is not a big difference between the two group means