A professor records the number of students who complain each week throughout the semester. If the class size is forty students, what are 3-sigma control limits for this class? Construct a control p-chart and interpret the data. Is the process in control?
|
Week number
|
Complaints
|
|
1
|
5
|
|
2
|
2
|
|
3
|
7
|
|
4
|
1
|
|
5
|
3
|
|
6
|
2
|
|
7
|
8
|
|
8
|
1
|
|
9
|
3
|
|
10
|
5
|
|
11
|
4
|
|
12
|
6
|
|
13
|
3
|
|
14
|
1
|
|
15
|
4
|