As a quality analyst you are also responsible for controlling the weight of a box of cereal. The Operations Manager asks you to identify the ways in which statistical quality control methods can be applied to the weights of the boxes. Provide your recommendations to the Operations Manager in a two-three page report. Using the data provided in the Doc Sharing area labeled M4A2Data, create Xbar and R charts.
Your report should indicate the following along with valid justifications of your answers:
- The control limits of the weights of the boxes.
- Nonrandom patterns or trends, if any.
- If the process is in control.
- The appropriate action if the process is not in control.
| Note: The following consists of 12 sets of three box weights in ounces | |||||
| N | #1 | #2 | #3 | StdDev | Xbar |
| 1 | 6.3 | 6.28 | 6.26 | 0.02 | 6.28 |
| 2 | 6.32 | 6.32 | 6.33 | 0.005773503 | 6.32333333 |
| 3 | 6.29 | 6.33 | 6.36 | 0.035118846 | 6.32666667 |
| 4 | 6.3 | 6.29 | 6.34 | 0.026457513 | 6.31 |
| 5 | 6.295 | 6.315 | 6.39 | 0.050083264 | 6.33333333 |
| 6 | 6.292 | 6.319 | 6.33 | 0.019553346 | 6.31366667 |
| 7 | 6.289 | 6.323 | 6.4 | 0.0568712 | 6.33733333 |
| 8 | 6.286 | 6.327 | 6.471 | 0.097161378 | 6.36133333 |
| 9 | 6.283 | 6.331 | 6.498 | 0.112855365 | 6.37066667 |
| 10 | 6.28 | 6.335 | 6.525 | 0.128549601 | 6.38 |
| 11 | 6.277 | 6.339 | 6.39 | 0.056589163 | 6.33533333 |
| 12 | 6.274 | 6.343 | 6.4 | 0.063095166 | 6.339 |
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