Table 511
Factors for Calculating Three-Sigma Limits for The The $\bar{x}$

Multiple Choice

Table 5.11
Factors for Calculating Three-Sigma Limits for the $\bar{x}$
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) .