The following samples have been taken from an on-going process. Use these values
ID: 3053519 • Letter: T
Question
The following samples have been taken from an on-going process. Use these values to create both an X bar and an R chart, and then answer the questions below.
Sample 1: 56 48 53 58 52
Sample 2: 50 59 57 54 54
Sample 3: 61 59 56 55 58
Sample 4: 57 51 46 57 50
Sample 5: 53 49 57 55 56
Sample 6: 56 55 60 58 56
1.What is the value of the centerline for an X bar chart? (Round to two decimal places)
2.The upper control limit for the X bar chart is:
3.The lower control limit for the X bar chart is:
4.The upper control limit for the R chart is:
5.The lower control limit for the R chart is
Explanation / Answer
The statistical software output for this problem is:
Control chart results:
Xbar Chart results:
Upper control limit = 59.503467
Center line = 54.866667
Lower control limit = 50.229867
R Chart results:
Upper control limit = 19.2384
Center line = 9.6
Lower control limit = 0
Hence,
1. Value of centerline for an X bar chart = 54.87
2.The upper control limit for the X bar chart = 59.50
3.The lower control limit for the X bar chart = 50.23
4.The upper control limit for the R chart = 19.24
5.The lower control limit for the R chart = 0