Question: A quality analyst has randomly chosen 5 packages from a packaging process for the last 6 days. Each package was weighed, and the results are
A quality analyst has randomly chosen 5 packages from a packaging process for the last 6 days. Each package was weighed, and the results are shown below in grams.
| Weigh | |||||||||
| Day | Package 1 | Package 2 | Package 3 | Package 4 | Package 5 | Sample Mean | Sample Range | ||
| Day1 | 23 | 22 | 23 | 24 | 22 | 22.8 | 2 | ||
| Day2 | 23 | 21 | 19 | 21 | 22 | 21.2 | 4 | ||
| Day3 | 20 | 19 | 20 | 21 | 20 | 20 | 2 | ||
| Day4 | 18 | 19 | 20 | 19 | 20 | 19.2 | 2 | ||
| Day5 | 18 | 20 | 22 | 20 | 21 | 20.2 | 4 | ||
| Day6 | 19 | 21 | 22 | 22 | 23 | 21.4 | 4 | ||
Perform and show all necessary calculations to do a full analysis of the variation you are seeing in this process. Make a conclusion about whether this process is in control. State your conclusion clearly. (Note:Graphs are not required).
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