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

All the above conditions mentioned hold good for I-MR Charts.