What is the major benefit of using Xbar charts over Individuals charts?
OPTIONS
- The Average charts are not sensitive to non-normality
- The Average charts provide tighter controls
- Average charts best indicate within and between subgroup variation
- Average charts show mean shift
ANSWER
The Average charts provide tighter controls
EXPLANATION
Xbar charts have tighter controls than the I-MR Charts, although a c and d are also right, but the second option is considered the major benefit.
