Question: You are in charge of the training program for pilots transitioning from fixed wing to rotary wings aircraft. You are considering the purchase of a simulator for initial training, but you are unsure if the quality of the simulator training will be worth the expenditure. You have access to data from another command similar to your own who has been using simulator training, and you want to compare the time that it took pilots to meet standards for rotary wing for those who initially were trained in the simulator (Command A) and those who were not (Command B). The times for meeting standards in terms of days are listed below.

Command A Command B

28 35

32 40

29 28

24 36

19 35

21 34

23 36

a. What is the null hypothesis?

b. What statistical procedure will you use?

c. Which Command has the better times? Is this statistically significant? Support your answer with statistical evidence.