Table 5.11 Factors for Calculating Three-Sigma Limits for the Chart and Chart

question 184

Multiple Choice

Table 5.11
Factors for Calculating Three-Sigma Limits for the Chart and R-Chart
Source: 1950 ASTM Manual on Quality Control of Materials,copyright American Society for Testing Materials.Reprinted with permission.
-Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world.Results from the last five samples are shown in the table.Calculate control limits for a chart that will monitor process consistency.The correct control limits as (LCL,UCL) are:

• A)(-5.37,5.37)
• B)(0.00,5.37)
• C)(0.00,6.03)
• D)(0.00,6.12)

---

Definitions:

Pessimistic

A tendency to anticipate unfavorable outcomes or emphasize the negative aspects of a situation.

Expected Time

An estimation of the duration it would likely take to complete a task, often used in project management for scheduling.

PERT Times

entails the estimated durations in the Program Evaluation and Review Technique, a method used in project management.

Optimistic Time

The shortest possible time in which a task or project can be completed, assuming everything goes better than expected.