As part of a larger study of the effects of amphetamines, a pharmacologist wished to investigate the claim that amphetamines reduce overall water consumption. She injected 25 standard lab rats with an appropriate dose of amphetamine and 30 with a saline solution as controls. Over the next 24 hours she measured the amount of water consumed by each rat and expressed the results in ml/kg body weight: saline amphetamine
n 9 16
X 134.1 112
s 16 35.6
Does the amphetamine significantly suppress water consumption? What is the null hypothesis?
a. x-saline = X-amphetamine
b. mu-saline = mu-amphetamine
c. x-saline < X-amphetamine
d. mu-saline

18. determine whether each stateme blank space given. ach statement is true (t) or false (f). place your answer in the 8. when a cell is put into an isotonic solution, individual wat put into an isotonic solution, individual water molecules cannot move back and forth across the cell membrane. d. when a cell is put into a hypertonic solution, there is a net movement of water molecules across the cell membrane into the cell. c. when a cell is put into a hypotonic solution, there is a net movement of water molecules across the cell membrane out of the cell. d. the movement of any solvent across a semi-permeable membrane is called osmosis. e. carrier proteins have the ability to change shape and physically move molecules across the cell membrane. f. in facilitated diffusion, the concentration of the molecules to be moved across the cell membrane is higher inside the cell.