Small boxes of NutraFlakes cereal are labeled “net weight 10 ounces.†Each hour, random samples of size n = 4 boxes are weighed to check process control. Five hours of observations yielded the following:
Weight
Time Box 1 Box 2 Box 3 Box 4
9 A.M. 9.8 10.4 9.9 10.3
10 A.M. 10.1 10.2 9.9 9.8
11 A.M. 9.9 10.5 10.3 10.1
Noon 9.7 9.8 10.3 10.2
1 P.M. 9.7 10.1 9.9 9.9
Using these data, construct limits for x- and R- charts. Is the process in control? What other steps should the QC department follow at this point?
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