A researcher from UCLA wants to know if rewards play a role in learning. They create two groups of rats and split them into two groups. One group will receive a treat every time they successfully complete a maze ( n = 30) and the other group will not (n = 35). The group of rats that receives treats is able to complete the maze in 41 seconds with a sample standard deviation of 4 seconds. The group that does not receive treats is able to complete the maze in 55 seconds with a standard deviation of 11 seconds. Do rewards end up affecting how the rats learn to get through the maze. State the alternative and null hypothesis. What T crit score should be used? Why