|
|
| |
|
| Characteristic of interest: |
Number of black spots per radiator grill. |
| |
|
| Measuring instrument: |
The observation will be performed with the naked eye (or with corrective lenses if normally worn), under the light available in the work station (in 100% working order, i.e., no burned-out bulbs). |
| |
|
| Method of test: |
The number of black spots per radiator grill will be counted by taking samples at the work station. The sample should be studied at a distance of 18 inches (roughly half an arm’s length) from the eye. Only the top surface of the grill is to be examined. |
| |
|
| Decision criteria: |
Wipe the top surface of the grill with the palm of your hand and look for any black specks embedded in the plastic. Any observed black speck of any size counts as a black spot. |
| |
|
| Example 2 Variables |
|
| |
|
| Characteristic of interest: |
Diameter of 48 inch rod |
| |
|
| Measuring instrument: |
Micrometer |
| |
|
| Method of test: |
The sample size is n=3. Measure 3 rods every hour. When the grinder releases the rod, take one measurement each at 8" down, 24" down, and 40" down from the notched end. Tighten the micrometer as much as possible. Record to 4 decimal points. If the fifth number to the right of the decimal point is 5 or higher, round the fourth number up one. |
