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 56 54
Sample 3: 61 59 56 55 58
Sample 4: 57 51 52 57 50
Sample 5: 52 49 57 55 56
Sample 6: 56 55 60 58 55
1. What is the value of the centerline for x bar chart? (round to two decimal places )
2. The upper control limit of x bar chart is?
3. The lower control limit for x batr chart is?
4. The upper control limit of the R chart is?
5. The lower control limit for R chart is ?