| Problem 9-18 |
| Malossdientes Candy Company | | Calculation of Sigma Value |
| | | | | | | | 1. Click the yellow cell, click on "fx" button above. Select "statistical" from category drop-down. Scroll down statistical selections. Find and select NORM.S.INV |
| | | | 1 | 2 |
| | | | | | | | 2. NORM.S.INV dialog box will open. Type in the following into the "Probability" text box: (1-.0588). Click OK. (see explanation to the right) | | | | | | | | | The reason for the equation is we have to identify the probability of finding a value between 1.000 and the mean of the distribution (0.0588 or 5.88) |
| | | | | | | | 3. In the blue cell, type in the standard sigma shift (p469) |
| | | | | | | | 4. Sigma Level (value) will auto-calculate. Explain what the Sigma Level means below: |
| Run Chart |
| Number of VALUES (<= 30) | | | Enter number of samples |
| | | | | | | | Copy Defects column into the yellow cells below. Sample # matches row # |
| Sample | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| Defects |
| Center | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! | ERROR:#DIV/0! |
| Sample | Defects | Center |
| | | | | | | | Chart will auto-populate and format |
| 1 | 2 | 5.88 |
| 2 | 4 | 5.88 |
| 3 | 7 | 5.88 |
| 4 | 6 | 5.88 |
| 5 | 4 | 5.88 |
| 6 | 7 | 5.88 |
| 7 | 3 | 5.88 |
| 8 | 3 | 5.88 |
| 9 | 4 | 5.88 |
| 10 | 3 | 5.88 |
| 11 | 9 | 5.88 |
| 12 | 8 | 5.88 |
| 13 | 9 | 5.88 |
| 14 | 15 | 5.88 |
| 15 | 11 | 5.88 |
| 16 | 2 | 5.88 |
| 17 | 7 | 5.88 |
| 18 | 7 | 5.88 |
| 19 | 8 | 5.88 |
| 20 | 3 | 5.88 | | | | | Explain what the chart is showing below: |
| 21 | 7 | 5.88 |
| 22 | 1 | 5.88 |
| 23 | 4 | 5.88 |
| 24 | 5 | 5.88 |
| 25 | 8 | 5.88 |
| Average | 5.88 |