Which of this is a situation when x bar and s charts should be utilized instead of x bar and R charts?

When sample standard deviation is less than 1

When sample range is more than 1

Which of this is a situation when x bar and s charts should be utiliz

1.	Which of this is a situation when x bar and s charts should be utilized instead of x bar and R charts?
A.	When sample size is constant
B.	When sample standard deviation is less than 1
C.	When sample range is more than 1
D.	When sample size is variable
Answer» E.