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

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 performance to target.The correct control limits as (LCL,UCL) are:

A) (70.46,73.39)
B) (68.94,74.89)
C) (69.71,74.14)
D) (69.80,74.05)