Assuming all other conditions for plotting control charts to be valid, which condition holds TRUE for plotting I-MR Charts?
OPTIONS
- When you can collect only one observation per day
- When it is not feasible to use averages chart for process control
- When within-subgroup variation is to small relative to batch-batch variation
- All of the above
ANSWER
All of the above
EXPLANATION
Conditions mentioned in the FIRST, SECOND, and THIRD options are valid for I-MR charts so the FOURTH is correct.
