Day 1 2 3 4 5 6 7

Subgroup size 5 5 5 5 5 5 5

Subgroup Mean 2.17 3.8 2.77 2.86 3.85 4 3.57

Subgroup Range 4.11 4.5 3.82 4.14 4.55 4.87 3.85

1)What is the D4 value from Control Chart Factor table?

A.0

B..577

C.2.144

D.Not computable

2)What is the Lower Control Limit for the Range?

A.-.213

B.0

C..828

D.5.748

3)Is the variation of this process in control?

A.The variation of this process appears out of control

B.The variation of this process appears in control

C.Need to check if mean of the process is under control first

D.Absolutely not

4)Is the mean of the process in control?

A.The mean of the process is never relevant

B.Does not matter since the variation of the process is out of control

C.The mean of the process appears in control

D.No, the mean of the process does not appear in control