Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:

-What is the LCL for a R chart?
A)3.68
B)8.398
C)3.125

Question

Use the information below to answer the following question(s).Use the "Factors for Control Limits" Table A.3 from the textbook where required:
  A control chart needs to be developed to determine if the temperature for a process is within control limits.Five samples each having 4 observations are taken and the sample measurements (temperature in degrees F)are noted in the table below:
 
-What is the LCL for a R chart?
A)3.68 
B)8.398 
C)3.125

Quizplus · Accepted Answer

The Lower Control Limit (LCL) for a R (Range) chart can be 0 because the range of a process cannot be negative. The LCL is calculated based on the process variability and for some cases, it might be mathematically possible to get a negative number, but practically, it's set to 0 since you cannot have a negative range of variation in a process.

Use the Information Below to Answer the Following Question(s)