Question

The table below shows the quantity measured for 12 samples (in kg). Create an xbar-chart and an R-chart and plot the values for the 12 samples. Comment on whether or not the process is in control or not. Also create an upper and lower spec limit for the data that results in a Cpk of at least 2.33.

Sample

Day 1
64.43
63.40
65.58
65.03
65.42
68.99
68.63
67.34
67.00
64.07
65.64
63.73
Day 2
65.53
67.43
66.63
64.54
64.76
65.43
65.67
67.27
67.55
63.14
65.69
68.54
Day 3
64.36
65.95
64.07
68.78
65.79
66.60
67.77
66.18
63.07
68.02
63.59
66.37
Day 4
64.75
68.94
66.50
64.33
68.50
66.91
67.52
67.80
66.72
68.79
65.34
68.57
Day 5
66.09
64.38
63.57
68.16
65.64
67.89
67.32
65.88
63.40
63.43
64.09
65.58
Day 6
63.15
64.27
64.22
66.70
68.55
64.78
67.70
63.53
68.52
68.95
64.75
63.56
Day 7
68.24
65.59
64.50
67.50
65.73
66.78
68.16
67.59
65.93
65.99
64.28
66.38
Day 8
66.59
67.14
64.72
65.05
64.35
68.79
66.59
64.50
64.02
66.41
63.15
65.63

Answer 1

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