Question: The flight department wanted to test the effectiveness of their new flight scheduling software. They gathered data from the twelve months before the installation and the twelve months after implementation of the new software. For ease of analysis the data are presented as the mean number of cancellations for each month.

a. What is the null hypothesis?

b. What test did you use? Why?

c. What did you find?

d. Write up your results using scientifically recognized form.

Data Set