Boeing believed that redesigning the cockpits of their F-18aircraft could reduce controlled flight into terrain(CFIT) accidents. To determine if this was the case, theyused two different flight simulators that were identical with theexception that one had the old cockpit design and the other had thenew cockpit design. Fifteen pilots were recruited to fly in bothsimulators. Twenty random “troubleshooting” exercises werepresented in each simulator and the number of CFIT accidents wasrecorded for each simulator type. The order of which simulator eachpilot fly in first was counterbalanced across subjects.

14. Old cockpit: M=6.0, New cockpit: M = 7.5
15. D= -1.47 with S_D = 3.05
16. We will use ? = .05
17. n = 15

Question 1: What are the null and alternativehypotheses, respectively? Write out using appropriatestatistical notation.

Question 2: What are the df??

Question 3: Given the df above, what is the critical value.

Question 4: What is the standard error forthe t statistic?

Question 5: What is the value of thet-statistic?

Question 6: Should the null hypothesis be rejected?Explain.

Question 7:

a) The old cockpit design was safer (i.e., led to fewer CFITaccidents).

b) The new cockpit design was safer (i.e., led to fewer CFITaccidents).

c) There was no different in thesafety (i.e., number of CFIT accidents) for the old cockpit designversus the new cockpit design.