The postmaster of a small western town receives a certain number of complaints each day about mail delivery.
DAY |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
Number of complaints |
4 |
11 |
16 |
8 |
9 |
6 |
5 |
14 |
15 |
7 |
6 |
4 |
2 |
11 |
a. Determine two-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places and final answers to 3 decimal places. Leave no cells blank - be certain to enter "0" wherever required. Round up any negative control limit value to zero.)
UCL
LCL
b. Is the process in control?
No
Yes