1. | Construct three histograms (using 5 to 7 cell intervals) to represent the three data sets below. |
2. | Draw in the specification limits below. |
Upper spec | 11 | 7.66 | 0.56 |
Target | 10.75 | 7.55 | 0.55 |
Lower spec | 10.5 | 7.45 | 0.54 |
|
3. | Answer each of the below questions for each histogram:
Note that the process has been designated as statistically stable from a previous study; a previous capability study has been run, and the results indicated an acceptable CpK of 1.67.
|
| a. Is the process capable? |
| b. Is the process acceptable? |
| c. Is the process random (i.e., bell-shaped)? |
| d. Is the process centered? |
| e. What would you do considering your analysis of each of the three histograms? |
|
| Histogram Analysis |
| Length | Width | Thickness |
10.67 | 7.52 | 0.551 |
10.74 | 7.57 | 0.546 |
10.68 | 7.55 | 0.546 |
10.72 | 7.55 | 0.557 |
10.66 | 7.53 | 0.546 |
10.69 | 7.56 | 0.542 |
10.7 | 7.53 | 0.545 |
10.72 | 7.57 | 0.537 |
10.69 | 7.55 | 0.552 |
10.68 | 7.54 | 0.547 |
10.72 | 7.56 | 0.546 |
10.7 | 7.58 | 0.545 |
10.7 | 7.55 | 0.56 |
10.73 | 7.55 | 0.548 |
10.75 | 7.54 | 0.546 |
10.73 | 7.56 | 0.543 |
10.69 | 7.54 | 0.548 |
10.68 | 7.55 | 0.545 |
10.7 | 7.55 | 0.553 |
10.77 | 7.55 | 0.537 |
10.72 | 7.54 | 0.549 |
10.69 | 7.56 | 0.541 |
10.66 | 7.56 | 0.543 |
10.69 | 7.57 | 0.545 |
10.63 | 7.54 | 0.549 |
10.68 | 7.55 | 0.546 |
10.73 | 7.56 | 0.545 |
10.74 | 7.57 | 0.539 |
10.65 | 7.54 | 0.541 |
10.69 | 7.55 | 0.545 |
10.7 | 7.54 | 0.547 |
10.72 | 7.56 | 0.543 |
10.75 | 7.53 | 0.545 |
10.71 | 7.54 | 0.546 |
10.72 | 7.55 | 0.547 |
|
(empty)
