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 47 57 50
Sample 5: 50 49 57 55 56
Sample 6: 56 55 60 58 54
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: