The flight department wanted to test effectiveness of their new flight scheduling software. They collected data from the 12 months before the installation and the 12 months after implementation of new software. For ease of analysis the data are presented as the mean number of cancellations for each month.
a. Determine the null hypothesis?
b. What test did you use? Why?
c. What did you find?
d. Write down your results using scientifically recognized form.
Data Set
|
Month
|
2003
|
2004
|
|
1
|
15
|
15
|
|
2
|
22
|
9
|
|
3
|
12
|
9
|
|
4
|
21
|
10
|
|
5
|
9
|
5
|
|
6
|
13
|
10
|
|
7
|
10
|
6
|
|
8
|
24
|
19
|
|
9
|
26
|
7
|
|
10
|
14
|
15
|
|
11
|
23
|
4
|
|
12
|
15
|
3
|