Rochester-Electro-Medical Inc. is a manufacturing company based in Tampa, Florida, that produces medical products. Management had the business objective of improving the safety of the workplace and began a safety sampling study. The following data (stored in Safety) represent the number of unsafe acts observed by the company safety director over an initial time period in which he made 20 tours of the plant.
Tour | Number of Unsafe Acts |
1 | 10 |
2 | 6 |
3 | 6 |
4 | 10 |
5 | 8 |
6 | 12 |
7 | 2 |
8 | 1 |
9 | 23 |
10 | 3 |
11 | 2 |
12 | 8 |
13 | 7 |
14 | 6 |
15 | 6 |
16 | 11 |
17 | 13 |
18 | 9 |
19 | 6 |
20 | 9 |
Source: Data extracted from H. Gitlow, A. R. Berkins, and M. He, “Safety Sampling: A Case Study,” Quality Engineering, 14 (2002), 405–419.
a. Construct a c chart for the number of unsafe acts.
b. Based on the results of (a), is the process in a state of statistical control?
c. What should management do next to improve the process?
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